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x- wiek bartka
y- wiek taty
x+y=45
y-x=25 /+x
x+y=45
y=25+x
x+25+2=45
2x+25=45 /-25
2x=20 /÷2
x=10
10+y=45 /-10
y=35
Odp: Bartek ma 10 lat, a jego tata 35.
Zadanie 2.
x+y+90=180
x-y=50
x+y=180-90
x-y=50
x+y=90
x-y=50
x=90-y
90-y-y=50
90-2y=50
-2y=50-90
-2y=-40
y=20
x-20=50
x=50+20
x=70
Odp. Kąty wynoszą 90,70 i 20.