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x=2
2x+3y=7
2*2+3y=7
3y=3
{y=1
{x=2
b)-3y=9
y=-3
x-2y=9
x-2*(-3)=9
x+6=9
{x=3
{y=-3
c)2y=8
y=4
2x+y=3
2x+4=3
2x=3-4
2x=-1
x=-1/2
d)5x=5
x=1
3x-y=7
3*1-y=7
{y=-4
{x=1