Answer:
5.x=-2,y=-2
7. y=1 , x=-1
Step-by-step explanation:
5. x+y=-4 equation 1
x-y=2 equation 2
x=-2
Equation 1, x=-2
-2+y=-4
y=-2
7.
-3x-4y=-1 equation 1
3x-y=-4 equation 2
-5y=-5
y=1
Equation-1 ,y=1
-3x-4=-1
-3x=3
x=-1
5. x+y=-4
x=-4-y
-4-y-y=2
-2y=6
y=-3
x-3=-4
x=1
7. (1)+(2), -3x-4y+3x-y=-1-4
3x-1=-4
