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b - x + 4
obw. - 4dm = 40cm
40 = 2x + 2(x+4)
40 = 2x + 2x + 8 | -8
32 = 4x | :4
x = 8
a - 8
b - 8 + 4 = 12
P =a * b
P = 12 * 8
P = 96
y-dł dłuższego boku
x+4=y |* (-2)
2x+2y=40
-2x-8=-2y
2x+2y=40
2y-8=-2y+40 |+2y |+8
4y=48 |:4
y=12
x+4=12 |-4
x=8
P=a*b
P=8*12
P=96