Question 1015557
7x-8y=-2
x-3y= 9  ; x=9 +3y
7(9+3y)-8y= -2
63+21y-8y= -2
13y= -65
y=-5
x=-6, from x=9+3y
Check by trying in first equation.
7(-6)-8(-5)=-42+40 = -2