Draw the graph of $x y = 20, x, y > 0$ . Use the graph to find $y_{1}$ when $x = 5$ , and to find $x_{1}$ when $y = 10$ . then $x_{1} + y_{1}$

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Solution

x 1 2 4 5 10 20
y 20 10 5 4 2 1
Any five points
x-axis, y-axis, scale
Ploting the Points and drawing the Rectangular Hyperbola
(i) If $x = 5$ then $y = 4$
(ii) If $y = 10$ then $x = 2$

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