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goldenfox [79]
3 years ago
9

X+2y=-1 and 4x-4y=20 solve by substitution

Mathematics
1 answer:
Illusion [34]3 years ago
8 0

To do this problem you would first need to factor out a variable, which in this case I would want to do the first equation because it is isolated. Now the equations would look like this:

x = -2y - 1

4x - 4y = 20

Since we know that x is now equal to -2y - 1 we can plug it in to the x value in the second equation:

4 (-2y -1) - 4y = 20

-8y -4 - 4y

-12y - 4 = 20

-12y = 24

y = -2

Now that we know the y value plug the y value to one equation to find the x, I will be using the first equation

x + 2(-2) = -1

x - 4 = -1

x = 3

Solutions:

y = -2

x = 3

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Serggg [28]
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3 years ago
It took Perla 8 games to score 30 points.At that rate,how many games will it take her to score 45 points?
BARSIC [14]

Answer:

I am pretty sure you can set up a proportion.

12 games is the answer

Step-by-step explanation:

8                  X

_        *         __

30                45


8*45=30x

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4 0
3 years ago
Write the fraction or mixed number as a percent. <br>5/6​
slamgirl [31]
5/6 as a percent is 83.33%
8 0
3 years ago
Today is sunday. Tom starts to read a book with 490 pages today. Sundays he reads 25 pages and on all other days he reads 4 page
mrs_skeptik [129]

Based on the information given, it can be noted that Tom will use 117 days to read the book.

How to solve a equation.

Based on the information given, we are informed that Tom starts to read a book with 490 pages today. Sundays he reads 25 pages and on all other days he reads 4 pages.

Let the number of days be represented by x. Therefore, the equation to solve the question will be:

25 + (4 × x) = 490

25 + 4x = 490

4x = 490 - 25

4x = 465

x = 465/4

x = 116.25

x = 117

Therefore, he'll use 117 days to read the book.

Learn more about equations on:

brainly.com/question/13763238

6 0
2 years ago
Find the slope and y-intercept for the table.<br><br><br><br> slope: <br><br> y-intercept:
Volgvan

Answer: 5 y=5

x=3

Step-by-step explanation:

3 0
3 years ago
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