Question

solve the system
x/4 - y/4 = -1
x + 4y = -9

Answer 1

solve the second equation for x
x = -9-4y
plug in -9-4y when you see an x in the first equation
(1/4)(-9-4y)-y/4 = -1
(-9-4y-y) = -4
-5y=5
....

Answer 2

then you plug in -1 for your y value in the second equation?

Answer 3

@zzr0ck3r