A firm selling plants has found that the number sold (N thousand) is related to the price (£P) by the formula 6P + N = 90.
a Draw the graph of N against P for OSN s 90.
(Put N on the vertical axis and P on the horizontal axis.)
b Use your graph to find the price when 30 000 plants were sold.
c Use your graph to find the number sold if the price is set at £8.
d Use your graph to find the price if 90 000 plants were sold. Is this a sensible value?

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