Question 715019
x/4-y/4=-1 
I don't care for fractions so multiply by 4
x-y=-4
Lets solve for x
x=y-4
Substitute what x equals into below equation


 x+4y=-9
(y-4)+4y=9
Solve for y
5y=13
y=13/5

x=y-4
x=13/5 - 4
x=13/5 - 20/5
x=-7/5