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3x+3y=6
x-y=3 /*3
3x+3y=6
3x-3y=9
6x=15 //6
x=2,5
x-y=3
x=2,5
2,5-y=3
-y=3-2,5
y=-0,5
x=2,5
b)
3x+2y=6
2x+y=4 /*-2
3x+2y=6
-2x-2y=-8
x=-2
3x+2y=6
-6+2y=6
2y=0
y=0
x=-2
c)
3x+2y=6
x-y=4/*2
3x+2y=6
2x-2y=8
5x=14
x=2,8
2,8-y=4
-y=1,2
y=-1,2
x=2,8
d)
2x+2y=6
x-y=4/*2
2x+2y=6
2x-2y=8
4x=14
x=3,5
x-y=4
3,5-y=4
-y=0,5
y=-0,5
x=3,5