rozwiaz
x+y=60
8x+12y=520
-8x-8y=-480
4y=40
y=10
x+10=60
x=50
x=60-y
8(60-y)+12y=520
480-8y+12y=520
4y=40 I:4
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x+y=60
8x+12y=520
-8x-8y=-480
8x+12y=520
4y=40
y=10
x+10=60
x=50
x+y=60
8x+12y=520
x=60-y
8(60-y)+12y=520
480-8y+12y=520
4y=40 I:4
y=10
x+10=60
x=50