If $x y = 20, x, y > 0$ . Use the graph to find $y$ when $x = 5$

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Solution

Plot $x y = 20$ on a graph paper. Then, From point $5$ on x-axis draw line parallel to y-axis and from that point draw line parallel to x-axis.
Both the lines intersect at the point $A (5, 4)$ .
So, At $x = 5$ , we get $y = 4$

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