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Irina18 [472]
3 years ago
9

Solve the system using elimination. y=-x-3 y=x2-15

Mathematics
1 answer:
Phoenix [80]3 years ago
7 0

Answer:

X=4, y=-7

Step-by-step explanation:

To use elimination method, you want to cancel x or y when adding the equations together. So let’s multiply the first equation by -2

2(y)=2(-x-3)

2y=-2x-6

——————

add above equation 2y=-2x-6

to second equation    Y=2x-15

add together.           3y=-21

                                   Y=-7

—————————————-

solve for x by substituting y value (7) into either equation

y=-x-3

-7=-x-3

-4=-x

4=x

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Correct question :

If the perimeters of each shape are equal, which equation can be used to find the value of x? A triangle with base x + 2, height x, and side length x + 4. A rectangle with length of x + 3 and width of one-half x. (x + 4) + x + (x + 2) = one-half x + (x + 3) (x + 2) + x + (x + 4) = 2 (one-half x) + 2 (x + 3) 2 (x) + 2 (x + 2) = 2 (one-half x) + 2 (x + 3) x + (x + 2) + (x + 4) = 2 (x + 3 and one-half)

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Step-by-step explanation:

Given the following :

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