Posted by **Anonymous** on Saturday, January 19, 2013 at 1:07am.

A firm selling CDs finds that the number sold (N thousand) is related to the price (£P) by the formula 6P + N = 90.

(1) Draw the graph of N against P for 0 < N < 90 (the vertical axis should be the P axis,

and the horizontal axis should be the N axis).

(2) Use your graph to find the price when 30 000 CDs are sold.

(3) Use your graph to find the number sold if the price of a CD is set at £8.

(4) Use your graph to find the price if 90 000 CDs are sold. Is this a sensible value?

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