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x-y=3
x+y+x-y=9+3
2x=12
x=6
6+y=9|-6
y=3
x=6
y=3
b)2x-y=4
x+y=11
2x-y+x+y=4+11
3x=15
x=5
10-y=4|-10
-y=-6|*(-1)
y=6
x=5
y=6
c)x-2y=-3
2x+3y=8
-3-x=-2y
2y=3+x
2x+1,5(3+x)=8
3,5x+4,5=8|-4,5
3,5x=3,5|:3,5
x=1
2y=3+1
2y=4|:2
y=2
x=1
y=2