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2x-y=-3
x=1-2y
2x-y=-3
x=1-2y
2(1-2y)-y=-3
x=1-2y
2-4y-y=-3
x=1-2y
-5y=-5
x=1-2y
y=1
x=1-2*1=-1
x=-1
y=1
a. jedno rozwiązanie
x+2y=1 /*(-2)
2x-y=-3
(-2x) - 4y=-2
2x-y=-3
-------------------
-5y=-5 /:(-5)
y=1
x+2y=1 /-2y
x=1-2y
x=1-2*1
x=1-2=-1
spr.
-1+2*1=-1+2=1
2*(-1)-1=-2-1=-3