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y-dłuższy bok prostokąta
2x+2y=160
x+8cm=y-10cm
2x+2y=160
x-y= -10cm-8cm
2x+2y=160
x-y= -18cm/*2
2x+2y=160
2x-2y= -36
-----------------
2x+2x=160-36
4x=124/:4
x=31
x-y= -18
31-y= -18
-y= -18-31
-y=-49/*(-1)
y=49
P=31cm*49cm
P=1519cm²-pole prostokąta
x+8cm=31cm=39cm-bok kwadratu
P=(39cm)²
P=1521cm²-pole kwadratu