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x+5y=-17 |*(-2)
2x-y=10
-2x-10y=34
-11y=44
y=-4
2x-y=10
2x+4=10 |-4
2x=6
x=3
2).
4a-2=b
3a+7b=1,5
4a-b=2 |*7
3a+7b=1,5
28a-7b=14
3a+7b=1,5
31a=15,5
a=0,5
4a-2=b
2-2=b
b=0
2x-y=10
x+5y=-17 /× (-2)
2x-y=10
-2x-10y=34
(2x redukuje się z -2x)
-11y=44
y=-4
2x-y=10
2x+4=10
2x=6
x=3
2).
4a-2=b
3a+7b=1,5
3a+7(4a-2)=1,5
3a+28a-14=1,5
31a=1,5+14
31a=15,5
a=0,5
4×0,5-2=b
2-2=b
b=0