Question
Assertion : The graph between $P$ and $Q$ is straight line, when $P / Q$ is constant.
Reason : The straight line graph means that $P$ proportional to $Q$ or $P$ is equal to constant multiplied by $Q$.

Answer

(a) According to statement of reason, as the graph is a straight line, $P \propto Q$, or $P=$ constant $\times Q$i.e. $\frac{P}{Q}=$ constant

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