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Question

y ax and y = 8 when x = 4 then, find

(i) The value of y when x = 9
(ii) The value of x when y = 144

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Solution

y α x y=kx 8=k×4 y=8 when x=4.k=82=4y=4x (It is the equation of variation.)(i) y=49 x=9y=12(ii) 144=4xx=36 x=362=1296

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