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y - wojtek teraz
(y-10) = 4(x-10)
(y+10)+(x+10)=100
y-10=4x-40
y+10+x+10=100
y=4x-30
y+x+20=100
y=4x-30
y+x=80
Do drugiego równania podstawiamy za za y : 4x-30
4x-30+x=80
5x-30=80
5x=110 / 5
x= 22
y+x=80
y+22 = 80
y = 58
Odp:
x = 22
y = 58