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JAMB UTME - Mathematics - 1986

Ibeere 1 Ìròyìn

If x varies directly as y3 and x = 2 when y = 1, find x when y = 5
Awọn alaye Idahun
α  y3
x = ky3
k =  x y 3
when x = 2, y = 1
k = 2
Thus x = 2y3 - equation of variation
= 2(5)3
= 250