The following table gives the cost and number of notebooks bought.

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

(ii) How many note books can be bought for ₹165.

From the above it’s clear that y = 15 × X

Putting the above value in graph we will find

(i) To find the cost of 7 books draw a line parallel to Y-axis from X = 7 to the curve and from the intersecting point of that line and the curve draw another line parallel to X-axis and the point at which the line intersect the Y-axis will give the cost of 7 books.so from the graph cost of 7 books is found to be ₹105

(ii) to find the number of book that can be purchased at a cost of 165 draw a line parallel to X-axis from Y = 165.from the point at which the line intersect the curve draw another line parallel to Y-axis and the point at which the line intersect x-axis will give the number of book.so we can buy 11 note books