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y- wiek ANi
x+y = 30
y=x-4
x+x-4=30
y=x-4
2x=34/2
y=x-4
x=17
y=13
Pozdrawiam ; )
kasia-x
x+x-4=30
2x=4+30
2x=34/:2
x=17
kasia-17
ania-13
x-4-wiek ani
x+x-4=30
2x-4=30 /+4
2x=34 /:2
x=17-kasia ma 17 lat
17-4=13-ania ma 13 lat
spr.13+17=30