The table shows some corresponding values of $x$ and $y$. $x$$20$$80$$100$ $y$$6$\(1

Question

The table shows some corresponding values of $x$ and $y$. $x$$20$$80$$100$ $y$$6$$1.5$$1.2$ Show that $x$ and $y$ are in inverse proportion. Sketch the graph of $y$ against $x$.

Accepted Answer

(a) $xy=120$. (b) $y=120/x$: the first-quadrant branch for positive values; both first- and third-quadrant branches on the full real domain.

Proving Two Variables in Inverse Proportion

Proving Two Variables in Inverse Proportion

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