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a = 3b
{ 2*3b + 2b = 28
a = 3b
{ 8b = 28 | :8
a = 3b
{ b = 3,5
a = 3 * 3,5
{ b = 3,5
a = 10,5
3x-dluzszy bok | 3*3,5=10,5
Ob=28cm.
Ob=2x+2*3x=28
2x+6x=28
8x=28/:8
x=3,5
Spr.
Ob=2*3,5 + 2*10,5=28
Odp:Jeden bok wynosi 10,5cm. a drugi 3,5 cm.