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2x+12=y
6x-2y=0
6x-y=-36
-y=-36
y=36
3x=36
x=12
za 12 lat mama x+12, córka 3x+12
za 12 lat stosunek wieku mamy do córki = 2
zapisujemy
(3x+12) / (x+12) =2
3x+12= 2* (x+12)
3x +12= 2x+24
x = 12
3x= 36
Mama teraz ma 36 lat córka 12
za 12 lat mama 48 córka 24 lata