Question

Use the combination method to solve for y: 5x + 3y = 12 and -5x + 4y = 16

y= 4
y= 0
y= -10
y= -4​

Answer 1

y = 4

Explanation:

We have,

5x + 3y = 12 ....(1)

and

-5x + 4y = 16 ....(2)

Adding equation (1) and (2),

0 + 7y = 28

or

7y = 28

Dividing both sides by 7,

y = 4

So, the value of y = 4.