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3x+1y=19
-3x-3y=-21
3x+y=19
------------------
-2y=-2
y=1
x+1=7
x=7-1
x=6
odp: Na 6 ławkach siedzi po 3 osoby, a na 1 ławce po 1 osobie.
Z.2.
x+y=10 /*-5
5x+7y=62
-5x-5y=-50
5x+7y=62
----------------
2y=12
y=6
odp:Do 6 wazonów.