x+y=3
x-2y=6
x=3-y
3-y-2y=6
-3y=3
y=-1
x=3+1
x=4
a) {x+y=3
{ x-2y=6
{ y= 3-x
{ x-2(3-x)=6
{ y=3-x
{ x-6+2x=6
{ x+2x= 6+6
{ 3x= 12/ :3
{ x=4
{ y= 3-4
{ y= -1
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x+y=3
x-2y=6
x=3-y
3-y-2y=6
-3y=3
y=-1
x=3+1
x=4
a) {x+y=3
{ x-2y=6
{ y= 3-x
{ x-2(3-x)=6
{ y=3-x
{ x-6+2x=6
{ y=3-x
{ x+2x= 6+6
{ y=3-x
{ 3x= 12/ :3
{ y=3-x
{ x=4
{ y= 3-4
{ x=4
{ y= -1
{ x=4