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telo118 [61]
3 years ago
8

Solve the system of equations using elimination. 4x - 7y = 5 9x – 7y = –15

Mathematics
1 answer:
Anni [7]3 years ago
8 0

Step-by-step explanation:

We have to get one positive 7y so,

4x-7y=5

9x-7y=-15

multiply anyone of the equation by -1. I choose the first one so,

4x+7y=-5

9x-7y=-15

we can now cancel the y's so the equation will be left with

-4x=-5

9x=-15

add the equations

5x=-20

divide by 5 n u get

x=-4

now plug in the x value in any one of the

equations

I choose the first one so,

4(-4)-7y=5

-16-7y=5

add 16 to both sides

-7y=21

divide by -7

y=-3.

finally check.

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Jennifer sold 57 pieces of art if she sold twice as many paintings as sculptures how many painting did she sell??
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