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x+5y=-17 /*(-2)
2x-y=10
-2x-10y=34
-11y=44/(-11)
y=-4
teraz obliczamy x :
2x-y=10
2x -(-4)=10
2x +4=10
2x=6 /:2
x=3
c)3m+n=9 /*5
2m-5n=-11
15m+5n=45
2m-5n=-11
17m=34/:17
m=2
obliczmy n:
2m -5n=-11
2 * 2-5n=-11
4-5n=-11
-5n=-15/:(-5)
n=3