Solve the following systems by graphing:
1)
y=-3 x+4
y=3x-2
2)
y=x+2
x=-3
3)
4x+y=2
x-y=3
Solve the following systems by substitution.
4)
y=4x-9
y=x-3
5)
x+7y=0
2x-8y=22
6)
-7x+2y=18
6x+6y=0