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2x+-6y=10
2x-4y=15
-2x+6y=-7
x-y=2
y-2x=1
drugie obustronnie razy 4
9x-4y=6
x+2y=8 /×2
9x-4y=6
2x+4y=16 dodaję stronami
9x+2x=16+6
11x=22/ ÷ 11
x=2
9×2-4y=6
18-4y=6
-4y=-18+6
-4y=-12
y=3
x=2
b. 2x+3y=5x-15
4x+20-2y+6=34
2x+3y-5x=-15
4x-2y=-20-6+34
-3x+3y=-15 /×2
4x-2y=8 /×3
-6x+6x=-30
12x-6y=24
-6x+12x=-30+24
6x=-6
x=-1
4×1-2y=8
4-2y=8
-2y=4
y=-2
x=-1
c.3x-y/x+2y =2
4x-8-3y-15=-6
3x-y/x+2y =2
4x-3y=8+15-6
3x-y/x+2y =2
4x-3y=17
3x-y=2(x+2y)
4x-3y=17
3x-y=2x+4y
4x-3y=17
3x-y-2x-4y=0
4x-3y=17
x-5y=0/ × -4
4x-3y=17
-4x+20y=0
4x-3y=17
20y-3y=17
17y=17
y=1
x-5=0
x=5
y-1