1. 2x-y=2
3x+y=8
2x-y=2
y=2x-2
3x+y=8
3x+2x-2=8
5x-10=0
x=10/5
x=2
2x-y=2
2*2-y=2
y=2
2. 4x+y=3
3x-y=11
4x+y=3
y=-4x+3
3x-y-11
3x-(-4x+3)=11
7x-14=0
x=14/7
x=2
4*2+y=3
y=-5
3. 4x-3y=3
4x-7y=-5
4x-3y=3
y=-(-4x+3)/3
4x-7y=-5
4x-7*(-(-4x+3)/3)=-5
-16/3x+12=0
x=12/(16/3)
x=2.25
4x-3y=3
4*(2.25)-3y=3
6-3y=0
y=6/3
y=2