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3x=y
x*3x=75
3x=y
3x(kwadrat)=75 /:3
3x=y
x2=25
3x=y
x=5
y=15
O=2x+2y
O=2*5+2*15
O=40cm
_____________
x*y=72cm
x=2y
2y*y=72
x=2y
2y(kwadrat)=72 /:2
x=2y
y2=36
x=2y
y=6
x=12
o=2x+2y
O=36cm
O=