Solve the system of equations by substitution. Write your solution as an ordered pair
4x+8y=20
x=3y-20

Answers

Answer 1

Answer: (-5,5)

Step-by-step explanation:

graphing the two equations on a calculator gets the point (-5,5)

Answer 2
Solving it by substitution is:

4(3y-20)+8y=20: substitute the second equation into the first equation (hence the name solving by substitution)
12y-80+8y=20: distribute 4 to 3y and 4 to 20
20y-80=20: combine like terms (12y+8y)
20y=100: add 80 to 20
y=5: divide 100 by 20 and you get 5

:)

Related Questions

Can someone help me with this plz its due today. I will give brainliest if you answer all 5 questions

Answers

For the first qestion

Answer:

1. Height: 6cm

Formula V/l*w=168/7*4

3. Volume: 84

Formula= l*w*h/3=7*3*12/3

4. Volume: 6

I couldn't find the last one but I hope this helps :)

Please hurry and do all of them please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 50 points

Answers

Can’t rlly see the picture

Answer:

There is no picture

Step-by-step explanation:

Elena and Jada are 24 miles apart on a path when they start moving toward each other. Elena runs at a constant speed of 5 miles per hour, and Jada walks at a constant speed of 3 miles per hour. How many hours does it take until Elena and Jada meet?

Answers

It will take 3 hours

What is the solution to the equation x2 = 16?
Explain.

Answers

It’s 8 because 2 time 8 is equaled to 16
The answer is 8 because

x2 = 16 you then divide both sides by 2 to get
the variable by itself so you end up with
x=8

if the scale factor is greater than 1...

A. the new image gets smaller
B. the new image gets larger
C. the new image stays the same

Answers

B. It gets larger

Have a good day

Answer:

B. the new image gets larger

Step-by-step explanation:

I think

Can someone help me with this

Answers

Answer:

60(10 -7) - (-26/2)^2 (do the problems in the parenthesis)

60(3) - (-13)^2  ( multiply 60 and 3 and then square -13)

180- 169 (subtract)

11

I'm pretty sure its 11 hope this helps

Use the Distributive Property to simply each expression.

6(11+x)

Answers

66+x is the answer. Have a great rest of your day :)

Answer:

66 + 6x

Step-by-step explanation:

Because the 6 is outside the parenthesis, that means you need to multiply everything in the parenthesis by 6.

6 x 11 is 66 and 6 x X is 6x. So the simplified expression would be 66 + 6x.


Tom's age is 4 of his mother's age. Tom is 12 years old. How old is his mother?
Answer:
Equation:

Answers

Answer: His mom's age is 48

Step-by-step explanation: If his age is 1/4 his mother, then if we know his age, we do the opposite. Multiply his age by 4, we get 48.

Answer:

His mother is 48 years old.

Step-by-step explanation:

12=12/1

To divide fractions, keep, change, flip.

12/1 x 4/1=48

A bake sale has 4 brownies for sale. Each brownie was cut into 6 slices. Each slice was sold for $9. How much money did the bake sale make for selling all of the brownies?

Answers

Answer:

54 dollars i think sorry if it is wrong im not the brightest

Step-by-step explanation:

Answer:

$216

Step-by-step explanation: 4 brownies is split into 6 slices each so 4x6=24. Altogether 4 brownies are 24 slices. If each slice cost $9 that means you multiply 24x9 which gets you $216 in profit.  

this is 4/8 questions im giving brainliest for pls help me :D

Answers

I don't really know but I think that it's B

Find the sale price of each item. Round to two decimal places when necessary.

Original Price: $48.60

Markup: 100%

Answers

This is what I know
Revenue is $97.20
Profit is $48.60

Which percent is equivalent to One-half?
1%
2%
25%
50%

Answers

Answer:

will be 50% eazy ez hhhhh

Step-by-step explanation:

I'm taking a topic assessment that will really boost my grade please help
Will mark brainliest

Answers

Answer:

I believe the answer is C

Step-by-step explanation:

It’s C your welcome please make me brainliest

You have 158 snow cones then you eat 19, but you gain 29. Now take that answer and divide it by 5.5

Answers

the answer is 30.54

The people who helps me gets points

Answers

Answer:

= 16 3/8

Step-by-step explanation:

Original amount of sugar: 15 3/4

Additional sugar: 5/8

15 3/4 + 5/8

= 63/4 + 5/8

= 126/8 + 5/8

= 131/8

^its right what he said

Brainliest to first, lol:)

Answers

Answer:

Im so sorry. Im trying to help but I might get it wrong I think its 41,228.

Answer:

00041228

Step-by-step explanation:

Solve for x: (10 points)


negative 6 over 5, multiplied by x minus 4 equals negative 46

Answers

Answer: x=35

Step-by-step explanation:

the answer is x=35 hope that helps

A store sells hardcover books for $8 and paperback books for $5. You buy 7 books, represented by the equation x + y = 7, where x is the number of hardcover books and y is the number of paperback books. The equation 8x + 5y = 38 represents the total cost. How many of each type of book did you buy?

Answers

Answer:

so paperback books is 25 and the hardcover book is 64

Step-by-step explanation:

you multiply the cost by the number of how much there is and bam you got it

HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE please

Answers

Answer:

50.5

Step-by-step explanation:

Sooo first we calculate edf. 11/2= 5.5, 5.5x5=27.5

And then we do the other part.9/5=4, and 4x11.5=46, and we need to cut that in half cuz it’s a triangle 46/2=23. We add up the rectangle and the triangle: 27.5+23=50.5

help pls.idk if the whole page is correct

Answers

You did good I checked

The cost of Mr. Patten's car insurance increased by 5% to $86.82 per month. What was the cost of his insurance before it increased?

a
$91.16
b
$82.69
c
$82.48
d
$81.82

Answers

I think c or b for the problem
I thick c is the one

help please and ty ! (no its not 388)

Answers

It is 484 I knwonir

Answer:

It is 484

Step-by-step explanation:

Happy Holidays❄️☃️

Which expression can be used to find the product of 720?

Question 2 options:

(7 x 2) x (3 x 5)


(8 x 9) x (2 x 5)


(9 x 7) x (2 x 5)


(9 x 8) x (3 x 5)

Answers

Answer:

(8 x 9) x (2 x 5) is the correct answer.

Step-by-step explanation:

(8 x 9)= 72

(2 x 5)= 10

72 x 10 = 720

(8 x 9) x (2 x 5) is the expression can be used to find the product of 720

What is Expression?

An expression is combination of variables, numbers and operators.

We need to find the expression can be used to find the product of 720

Product is nothing but multiplication.

Multiplication is a method of finding the product of two or more numbers

(8 x 9) x (2 x 5)

Eight time of nine times two times of five

Eight times of nine is seventy two and two times of five is ten

72×10

Seventy two times of ten is Seven hundred twenty

720

Hence, (8 x 9) x (2 x 5) is the expression can be used to find the product of 720

To learn more on Expressions click:

https://brainly.com/question/14083225

#SPJ2

hector's bag contains three kinds of marbles. he is 2 times more likely to randomly select a white marble than a striped marble. he is equally likely to select a white marble as a dotted marble. of the original bag of 10 marbles is tripled, keeping the ratios of striped, dotted, and white marbles the same, how many of each type of marble are in the bag?

Answers

Answer: 12 white, 12 dotted and 6 striped

Step-by-step explanation:

There are 10 marbles. There are twice as many white marbles than striped marbles, and there are the same amount of white marbles and dotted marbles.

Trial and error concludes that there are 4 white marbles, 4 dotted marbles and 2 striped. Then, you have to triple them (multiply by 3)

4x3=12

4x3=12

2x3=6

12 white, 12 dotted and 6 striped

whoever has the best expalination to this gets brainliest: what do you want for christmas? and what is my fav color.

Answers

Answer:oh ok

Step-by-step explanation:

What I want is honesty a home cuz I’m broke and I think ur fav color is green cuz I’m guessing

great explanation right

I want some mine coins for a new skin and your fav color is megenta

What’s the answer ?plz helppp

Answers

can u post the other part of the problem

54 3/4 - 1 3/8
dont even try using a calculator lol the answer will be wrong

Answers

Answer:

54  3/ 4   −1  3/ 8  =53  3/ 8

hope this helps

if u need step by step answer just tell me

Kendra rides her bike to school each day. It takes her 10 minutes to ride 30 blocks. What unit rate would express the speed of Kendra's bike ride?

2 blocks per minute
3 blocks per minute
4 blocks per minute
10 blocks per minute

Answers

Answer:

The answer is currently B. 3 blocks per minute!

Hope this helped you out! :D

Answer:

3 blocks

Step-by-step explanation:

It’s actually pretty easy , all you have to do is divide the rate of distance to the rate of time to get the rate of speed like this chart . To get speed you need to divide D (Distance) by T (time) hope this helps also plz mark me brainliest

How is 16.666666 . . . written as a fraction
What is .33333333333 . . . if you convert it into a fraction?

Answers

1/3 ANS

hope this helps and i hope u ace it

last brainliest if u get this right :D

Answers

Answer:

B

Step-by-step explanation:

Geneva is 12 degrees celsius colder than her hometown, and on the graph we can see that Geneva is -3 degrees celsius, so -3 + 12 = 9, so it's San Francisco which is 9 degrees celsius.

It’s b he is right guys
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