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2a + 2b = 28
b= 3a
2a + 2×3a= 28
2a + 6a= 28
8a= 28
a= 3,5
b= 3 ×3,5= 10,5
a - jeden bok
3a - drugi bok
28 = 2a + 2(3a)
8a = 28 /:8
a = 3,5 cm
3,5cm - jeden bok
3 * 3,5cm = 10,5 cm - drugi bok
odp.: ten prostokąt ma boki równe 3,5cm, 3,5cm, 10,5cm, 10,5cm.