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3x=y-6
y=2x-5
3x=2x-5-6
x=-11
y=-22-5=-27
b) 7x-y+17=0
5x+6y=8
y=7x+17
5x+6(7x+17)=8
47x=-94
x=-2
y=3
c) y-2x=6
y=3+x
6+2x=x+3
x=-3
y=0
2x-y=5
3x=y-6
y=2x-5
3x=2x-5-6
y=2x-5
x=-11
y=2*(-11)-5
x=-11
y=-22-5
x=-11
y=-27
x=-11
b)
7x-y+17=0
5x+6y=8
y=7x+17
5x+6(7x+17)=8
y=7x+17
5x+42x+102=8
y=7x+17
47x=-94
y=7x+17
x=-2
y=7*(-2)+17
x=-2
y=3
x=-2
c)
y-2x=6
y=3+x
y=3+x
3+x-2x=6
y=3+x
-x=3
y=3+x
x=-3
y=3+(-3)
x=-3
y=0
x=-3