(1)y=2x-5
3x+2(2x-5)=-3
7x-10=-3
x=1
y=2x-5=-3
(2)x=3+2y
3(3+2y)+y=2
9+7y=2
y=-1
x=3+2y=1
(3)x=7+3y
4(7+3y)-9y=22
28+3y=22
y=-2
x=7+3y=1
(4)y=(5x-3)/2
10x-3((5x-3)/2)=4
x=-1/5
y=(5x-3)/2=-2