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Obw=2a +2b
b-a=10
b=10+a
36=2*a +2* (10 +a)
36=2a +20 +2a
16=4a | :4
a=4
b-4=10
b=14
P=a*b = 4*14 =56
x - jeden bok = 14
y - drugi bok = 4
x-y = 10 |×2
2x + 2y = 36
2x - 2y = 20
2x + 2y = 36
2x + 2x = 56
4x = 56|÷4
x = 14
P = a×b
P = 14×4 = 56