Q5 of 19 Page 278

Draw the Graph of xy = 20, x, y > 0. Use the graph to find y when x = 5, and to find x when y = 10.

We are given that xy


= 20


⇒ y = (20/x)


We can find different value of Y by taking values of x between 1 and 10




From the graph we get that at x = 5, y = 4, and to find y = 10, x = 2


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Draw the graph and hence (i) find the cost of seven note books.


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