Mathematics High School

solve the system by substitution -x+3y=15
y=2x​

Answers

Answer 1

Answer:

(3,6)

Step-by-step explanation:

Related Questions


Explain WHY a rotation of 180° is the same as doing
reflection over the x-axis AND the y-axis?

Answers

The 180 degree acts like both a horizontal (y axis) and vertical (x axis) reflection in one action.Precisely. Although they appear similar at first,rotating a figure 180 degrees swaps the image left-to-right and top-to-bottom at once.

Fihding the Selling Price for a Given Profit
Soccer ball profit
y = -6x2 + 100x – 180
Suppose the store wants to earn a daily profit of
$150 from the sale of soccer balls. To earn this
profit, what price should the store charge for each
soccer ball? Explain how to solve this problem.
DONE
) Intro
6 of 8

Answers

Answer:

2.05 and 14.61

Step-by-step explanation:

On Edg

Select steps that could be used to solve the equation 1 + 3x = -x + 4.

A.subtract 1, add x, divide by 4
B.add x, subtract 4, divide by 4
C.add x, subtract 1, divide by 4
D.subtract 3x, subtract 4, divide by -4
E.subtract 3x, subtract 4, divide by 4

(More than one answer)

Answers

Answer:

A, C & D

Step-by-step explanation:

A) 1 + 3x = -x + 4  {subtract 1}

  1 + 3x -1 = -x + 4 - 1

       3x     = -x + 3         {add x}

     3x + x = -x + 3 + x

        4x    = 3       {Divide by 4}

       4x/x = 3/4

x = 3/4

C) 1 + 3x = -x +4            {Add x}

  1+ 3x + x = - x +4 + x      

   1 + 4x  = 4    {subtract 1}

        4x = 4 - 1

        4x = 3   {Divide by 4}

D) 1 + 3x = -x + 4        { Subtract 3x}

         1    = -x + 4 -3x

         1 = -4x + 4          Subtract 4}

      1 - 4 = -4x

        -3 = -4x              {Divide by -4}

       -3/-4 = x

x = 3/4  

          x = 3/4

A hamburger costs $(2x + 3), chips costs $(x - 1) and a drink costs $(3x - 5). Write an
algebraic expression for the total cost of a hamburger, chips and a drink.

Answers

Answer:

(2x+3)+(x-1)+(3x-5)

Step-by-step explanation:

add all your expressions & Ect together .

1. The sum of two consecutive integers is 27. What are the two integers?|

Answers

Answer:

13 and 14

Step-by-step explanation:

y+1=1/2(x-8) in standard form- pls explain​

Answers

x-2y=10 is correct.

Y=2x+6
3y-x+3=0

Substitute to solve

Brainliest for correct answer

Answers

Answer:

-21/5 or -4.2

Step-by-step explanation:

y = 2x + 6

3y - x + 3 = 0

Substitute the value for y from the first equation into the second equation.  Solve for x.

3y - x + 3 = 0

3(2x + 6) - x  + 3= 0

6x + 18 - x + 3 = 0

5x + 18 + 3 = 0

5x + 21 = 0

5x + 21 - 21 = 0 - 21

5x = -21

x = -21/5 or -4.2

2.5(a + 4) + 0.5a = 12.4

Answers

Answer:

a=0.8

Step-by-step explanation:

First I distributed 2.5 into (a+4) and got (2.5a+10)+0.5a=12.4. I then combined like terms which are 2.5a and 0.5a and got 3a+10=12.4. I subtracted 10 from both sides to get rid of it and got 3a=2.4. Later, I divided 3 from both sides to get a which comes out to be 0.8.

Hope this helps you :)

The reflection of point S across the y-axis is point
. The reflection of point Q across the x-axis and the y-axis is point
, whose coordinates are (
,
).

Answers

Point V
Also point V
(-5,-5.5)

A circular garden has a diameter of 8 feet, and a rectangular garden has side lengths of 5 feet by 9 feet.
find the difference in square feet between the two gardens

Answers

Answer:

rectangular

Step-by-step explanation:

Answer:

The square of a number decreased by 8 times the number equals 9. Determine the two possible values of the number. X2-8x=9. +1-9 ... 9. Basic Area of Rectangles. 16 The length of a rectangular room is 5 less than ... 17 The total area of Jon's backyard is 144 square feet. ... the length of a side of the original square garden.

Step-by-step explanation:

i hope this helps!

please help me on this i am struggling

Answers

Answer:

1. 128=x

2.37=x

3. 55=x

4. 15=x

5. 76=x

Step-by-step explanation:

1. 128 (vertical angles are equal to each other)
2. 55 (the sum of the angles has to be 90 degrees because is perpendicular 55+35=90)
3. 2x+1=75
-1 -1
2x=74
2 2
X=37
(Vertical lines equal to each other that’s why I did this 2x+1=75)

5. 76 (because perpendicular and has to add 90 degrees 76+14=90)

6. 63 ( because a straight line = 180 degrees
117+63=180)
7. 21 ( because is perpendicular and has to add 90 degrees 69+21=90)

8. 49 (because is perpendicular and has to add 90 degrees 49+41=90)

9. 5x+110=180
-110 -110
5x=70
5 5
X=14
(Because straight line has to add to 180 degrees that’s why I did this 5x+110=180)

10. 53 (because straight line has to add to 180 degrees 127+53=180)

Hope that helps and you understand now :)

There is 1500 ft of fencing available to make 6 identical pens. Find the maximum area for EACH pen (meaning maximum of one pen).​

Answers

Answer:

The maximum area is therefore is 93750 ft²

Step-by-step explanation:

The given parameter are;

The a]length of fencing available = 1500 ft.

The perimeter of the figure = 9·x + 4·y

Therefore, 9·x + 4·y = 1500 ft.

The area of the figure = 6 × (x × y) = 3·x × 2·y

From the equation for the perimeter, we have;

9·x + 4·y = 1500

y = 1500/4 - 9/4·x = 375 - 9/4·x

y = 375 - 9/4·x

Substituting the value of y in the equation for the area gives;

Area = 3·x × 2·y = 3·x × 2·(375 - 9/4·x) = 2250·x - 27/2·x²

Area = 2250·x - 27/2·x²

The maximum area is found by taking the derivative and equating to zero as follows;

d(2250·x - 27/2·x²)/dx = 0

2250 - 27·x = 0

x = 2250/27 = 250/3

x = 250/3

y = 375 - 9/4·x = 375 - 9/4×250/3 = 187.5

The maximum area is therefore, 3·x × 2·y = 3 × 250/3 × 2 × 187.5 = 93750 ft²

The maximum area is therefore = 93750 ft.²

Multiply and simplify the following complex numbers:
(3 – 41) x (-3+22)

Answers

Answer:

Your answer is going to be - 722

Step-by-step explanation:

(3-41)=-38

(-3+22)=19

-38*19=-722

Answer:  (3 – 41) x (-3+22)= -722

When you go to do the multiplication or any math like this

parentheses,

exponents,

multiplication &division,

addition & subtraction,

Multiplication and division go together, so you do whichever one comes first. Same with addition and subtraction,

So If you do the math in P-E-M-D-A-S (3−41)(−3+22)

=−38(−3+22)

=(−38)(19)

=−722

-722 is your answer

Let p(n) be the number of primes less than n. What is p(50)

Answers

Answer:

There are 15 prime numbers less than 50

Step-by-step explanation:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53

What is the equation of the line that passes through the point (1,0) and has a slope of 1 ?

Answers

Answer:

y = x - 1

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Here m = 1 , thus

y = x + c ← is the partial equation

To find c substitute (1, 0) into the partial equation

0 = 1 + c ⇒ c = 0 - 1 = - 1

y = x - 1 ← equation of line

The charge of ISD from Biratnagar to Tokyo is Rs 125 for the first 3 minutes and Rs 15 for every additional 10 seconds. If a man made a call from Biratnagar to his friend in Tokyo and paid Rs 305, how long did he make a call

Answers

We know he talked for over 3 minutes since the total is 305 which is > 125 (the cost of 3 minutes). The remaining amount he paid is 305-125= 180. He was charged 15 per 10 seconds which amounted to 180. 180/15=12 which means he was charged 12 times. Each time charged it was because he took 10 seconds so in total he took 12x10= 120 second. That’s 2 minutes. The two minutes he was charged 15s plus the first 3 minutes he was charged 125 is 5 minutes. We can plug in the numbers to make sure we are right. If he talked for 5 minutes then we know for the first three he was charged 125 and the additional two he was charged 15s (s representing 10 seconds). We can put the 125 aside for now to figure out the 15s. If he took two minutes then he took 120 seconds. Divide that by 10 because he’s getting charged per 10 seconds not per second so that’s 12. 15(12) is 180. 125 + 180 is 305

*** he took five minutes talking on the phone***

You might need: What is the next term of the geometric sequence? -1/7, 4/7, -16/7
​

Answers

a4= 64/7 a5=-256/7 a6=1024/7

This is the problem that I need help with please. :)

Answers

Answer:

umm I think it 186

Step-by-step explanation:

Q1)Complete the table of values of y=6/x

Q2)Which of A,B or C is the correct curve for y=6/x


I will give brainliest!!! Help pleaze​

Answers

Answer:

Q1) 12, 2, 1.5, 1

Q2) I believe its C

Step-by-step explanation:

Hope it helps!

Answer:

1st question 12, 2, 1.5, 1

2nd question C

Step-by-step explanation:

Hope I helped

can some one please help me im confused on this im really stuck :(

Answers

A- swimming up 5 feet means +5 and -9+5=-4
The answer is A
Because moving 5 units up from -9 , you will end up at -4 ( 4 units below sea level)

If two lines are perpendicular to each other, do they lie in the same plane?

Answers

Yes they do, Hope this helps :p

Write an algebraic expression that models the following statement:

Four times the sum of 'x' and '7'.

Answers

Answer:

4(x+7)

or 4x+28

Step-by-step explanation:

Here you go:)

I NEED THIS IN 10 MINUTES !!
I HAVE A TEST AND WON OF THE QUESTIONS ARE SUPER DIFFICULT , the sum of 12 millions and 17 millions !!

Answers

Answer:

29,000,000

Step-by-step explanation:

Answer:

29,000,000,000

Step-by-step explanation:

Find the slope of the line passing through the points (-2, 8) and (3,8).
Please help!!

Answers

Answer:

y=8

Step-by-step explanation:

(-2,8) (3,8)

x,y. x,y

y2-y1/X2-X1=

8-(8)= 0

3-(-2)= 5

since the two points have 8 in the Y space the line would be equal to y= 8

I NEED HELP THIS IS MISSING I GIVE BRAINLIEST only if you are right tho

Answers

Answer:

I thinks its negative

Step-by-step explanation:

because since there is more neagitive that positive it will be neagitive

Can 6/-6 be simplified?

Answers

Answer:

yes. it would technically be -1

Step-by-step explanation:

Because fractions are technically division, 6 ÷-6 = -1

Answer:

yes it can be simplified to 6/6 thats the lowest term

Step-by-step explanation:

hoped it helped

can u give me a brainlist?

Oak Street intersects with Mill Avenue. The traffic light on Oak Street follows a cycle. It is green for 35 seconds, yellow for 5 seconds, and red for 20 seconds. As you travel along Oak and approach the intersection, what is the probability that the first color you see is red? Write the probability as a simplified fraction. Incorrect feedback has been removed from the screen. Fill in the blank text field 1

Answers

Answer:

1/3

Step-by-step explanation:

20/60 simplified is 1/3

20 for the red light

60 all of them added

Solve one third plus seven ninths equals

Answers

Answer:

1 1/9 0r 10/9

Step-by-step explanation:

the least common denominator or LCM of the two denominators:

LCM of 3 and 9 is 9

For the 1st fraction, since 3 × 3 = 9,

1

3

=

1 × 3=3

3 × 3=9

= 3/9

Likewise, for the 2nd fraction, since 9 × 1 = 9,

7

9

=

7 × 1=7

9 × 1=9

=7/9

Add the two fractions:

3

9

+

7

9

=

3/9+ 7/9=10/9

So, 1/3 + 7/9 = 10/9

In mixed form: 1 1/9

Write the following number in standard form: 3.471 x 10 to the power of negative 3

Answers

Answer:

=-3471 is the answer this may help you.

Step-by-step explanation:

=3.471×10^-3

=3.471×-1000

=-3471

Find the slope of the line that passes through each pair of points: (8, -2) , (1, 1)

Answers

Answer:

3/-7

Step-by-step explanation:

Using the equation [tex]M=\frac{Y_{2}-Y_{1}}{X_{2}-X_{1}}[/tex] where M is slope, you take (1--2) 1+2/1-8 and you get 3/-7.

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