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b - szerokość = ?
2a + 2b = obwód = 68 cm
a = 3b + 2
2(3b + 2) + 2b = 68
6b + 4 + 2b = 68
8b = 68 - 4
8b = 64
b = 8 cm
a = 3b + 2 = 3 razy 8 + 2 = 24 + 2 = 26 cm
a - długość = 26 cm
b - szerokość = 8 cm