Solve for y

2x + y = 7

6x + 9 = 9y - 2x

This is a simultaneous equation

1) 2x+y=7

2) - 8x+9y=9

1) * 4 (so 2x becomes 8x so we can add or take to get rid of x)

1) 8x+4y=28

2) - 8x+9y=9

2) + 1)

13y=37

Y=2.846153846

To check the answer is correct find x

8x + (4*2.84 ...) = 28

8x=28-11.384 ...

8x=16.615 ...

X=2.0769 ...

Input into 2)

(-8*2.07 ...) + (9*2.84 ...) = 9

It is equal to 9

So y is correct

Step-by-step explanation:

what grade are u in?