Answer: x = 4, y = -8
Explanation:
Because 2 is a multiple of four, multiply the first equation by two to eliminate the x value and effectively isolate y.
4x - 4y = 48
4x + 7x = -40
If we were to subtract the x values, that gives us -11y = 88, or y = -8.
Then, just plug y into your equation of choice.
2x - 2(-8) = 24
2x + 16 = 24
2x = 8
x = 4
One way you can check whether the values is right is plug the y value into the other equation and see if you receive the same answer.
4x + 7(-8) = -40
4x = -40 + 56
4x = 16
x = 4