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y-1=x+1 ---->uklad rownan
2x+2y=28
y=x+2
2x=28-2y
y=x+2
x=14-y
y=14-y+2
x=14-y
2y=16 x=14-8
y=8 x=6
przekątna prostakąta
a do kwadratu + b do kwadratu = c do kwadratu
6x6 + 8x8 = c do kw
100= c do kw
10=c ---> przekątna ;)