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10 - 3 = 7
7 x 3 = 21
24 + 4 = 28
10 + 4 =14
14 x 2 =28
Olek= 24 lat
Bolek= 10 lat
x + 4 = 2y + 8
x - 3y = -9 + 3
x - 2y = 8 - 4
x - 3y = -6
x - 2y = 4 / * (-1)
x - 3y = -6
-x + 2y = -4
(znak dodawania równań)
-y = -10
y = 10
x - 30 = -6
x = 24
y = 10
Odp: Olek ma 24 lata a Bolek 10 lat.
y-obecny wiek olka
y-3=3(x-3)
y+4=2(x+4)
y-3=3x-9
y+4=2x+8
y=3x-6
3x-6-2x=8-4
x=4+6
x=10
y=3×10-6=24
bolek ma 10, a olek 24 lata