Solve the system of equations using elimination.

4x - 7y = 5

9x - 7y = - 15

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.