Answer:
x=7
y=10
Step-by-step explanation:
I -7x + 4y = -9 | *3
II 5x - 3y = 5 | *4
Ia -21x + 12y = -27
IIa 20x - 12y =20
IIa + Ia = IIb
IIb -x = -7 |*(-1)
x in I
-7*7 + 4y = -9
-49 + 4y = -9 |+49
4y = 40 |/4
y =10
