Question

This is algabra 1 i need 7,13, and 14

Answer 1

11.)7x-4y=-30
+3x+4y=10
10x=-20
x=-2
3(-2)+4y=10
-6+4y=10
4y=4
y=1
13.)3x-y=-20
-(-7x-y=40)
3x-y=-20
+7x+y=-40
10x=-60
x=-6
3(-6)-y=-20
-18-y=-20
+18 +18
-y=-2
y=2
14.) 2x-6y=-10
-(4x-6y=10)
2x-6y=-10
-4x+6y=-10
-2x=-20
x=10
2(10)-6y=-10
20-6y=-10
-6y=-30
y=5