WAEC 2024 · Paper 1 · Q13

Variation

A variable $W$ varies partly as $M$ and partly inversely as $P$ . Which of the following correctly represents the relation with $k_1$ and $k_2$ as constants?

Worked solution (try it first)

"Partly … partly" means the variable is a sum of two parts, each with its own constant.
The part that varies as $M$ is $k_1M$ , and the part that varies inversely as $P$ is $\dfrac{k_2}{P}$ .
So $W = k_1M + \dfrac{k_2}{P}$ , option C.

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