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Question

(a) Draw the graph of the function y = 3x.
(b) From the graph, find the value of y, when
(i) x = 3
(ii) x = 5
(iii) x = 6

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Solution

a The given function is y=3x.For some different values of x, the corresponding values of y are given below:
x 0 1 2
y 0 3 6



On a graph paper, plot the points O0,0, A1,3 and B2,6. Join them successively to obtain the required graph.



bReading off from the graphi On the x-axis, take the point L at x=3.Draw LPx-axis, meeting the graph at P.Clearly, PL=9 units x=3y=9ii On the x-axis, take the point M at x=5.Draw MQx-axis, meeting the graph at Q.Clearly, QM=15 units x=5y=15iii On the x-axis, take the point N at x=6.Draw RNx-axis, meeting the graph at R.Clearly, RN=18 units x=6y=18

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