Elimination method:
(8y + 7x) + (-8y + 9x) = (-75) + (-5)
8y + 7x - 8y + 9x = -75 - 5
16x = -80
x = -5
Substitute x = -5 into 2nd equation:
8y + 7x = -75
8y + 7(-5) = -75
8y - 35 = -75
8y = -40
y = -5
Answer: x = -5, y = -5
Don’t believe me, you plug this values into each one.