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The graph between two quantities $P$ and $Q$ is a straight line when
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$\frac{P}{Q}=$ constant
When the graph between two quantities $P$ and $Q$ is straight line as shown in the figure, then slope of the graph remains constant.
i.e. slope $=\tan \theta=\frac{P}{Q}=$ constant
i.e. slope $=\tan \theta=\frac{P}{Q}=$ constant
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