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y- wiek córki
x = 7y
x+20 = 2(y+20)
x+20 = 2y+40
7y+20=2y+40
7y-2y=40-20
5y=20 /:5
y=4
x= 7*4 = 28
Spr. 28+20 = 2(4+20)
48=2*24
48=48
Odp: Ta pani ma 28 lat.
a- wiek córki
x = 7y
x+20 = 2(y+20)
x+20 = 2y+40
7y+20=2y+40
7y-2y=40-20
5y=20 /:5
y=4
x= 7*4 = 28
Odp: Ta pani ma 28 lat.
y-obecny wiek córki
x=7y
x+20=2(y+20)
7y+20=2y+40
7y-2y=40-20
5y=20
y=20:5
y=4
x=7y=7 razy4=2
mama ma 28, a córka 4 latka