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www.GOALias.blogspot.comOxygenOther gasesYX O XWeight (in kg)Fig. 13.9 A pie chart showing compositionof airY80706050403020102 4 6 8 10 12 14 16 18 20 22Age (in year)NitrogenFig. 13.10 A line graph showing change inweight of a man with ageTake a sheet of graph paper. Drawtwo lines perpendicular to each otheron it, as shown in Fig. 13.11. Mark thehorizontal line as XOX'. It is known asthe x-axis. Similarly mark the verticalline YOY'. It is called the y-axis. The pointof intersection of XOX' and YOY' isknown as the origin O. The twoquantities between which the graph isdrawn are shown along these two axes.We show the positive values on thex-axis along OX. Similarly, positivevalues on the y-axis are shown alongOY. In this chapter we shall consideronly the positive values of quantities.XYFig. 13.11 x-axis and y-axis on a graph paperTherefore, we shall use only the shadedpart of the graph shown in Fig. 13.11.Boojho and Paheli found out thedistance travelled by a car and the timetaken by it to cover that distance. Theirdata is shown in Table 13.6.Table 13.6 The motion of a carS. No. Time1. 0 0Distance2. 1 min 1 km3. 2 min 2 km4. 3 min 3 km5. 4 min 4 km6. 5 min 5 kmYou can make the graph by followingthe steps given below:• Draw two perpendicular lines torepresent the two axes and markthem as OX and OY as in Fig. 13.11.• Decide the quantity to be shownalong the x-axis and that to beshown along the y-axis. In this case152SCIENCE