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x- wiek Michała
y - wiek Asi
x+y=28
x-11=2y /+11
x+y=28
x=2y+11
2y+11+y=28 /-11
x=2y+11
3y=17 /:3
x=2y+11
y=5⅔
x= 11⅓+11
y=5⅔
x= 22⅓
x- wiek Michała
y- wiek Asi
x+y=28
x-11=2(y-11)
x=28-y
28-y-11=2y-22
x=28-y
-y-2y=-22-17
x=28-y
-3y=-39 /*(-1)
x=28-y
3y=39
x=28-y
y=13
x=28-13
y=13
x=15
x=13
15-13=2
Obecnie Michał jest o 2 lata starszy od Asi