After analyzing sales figures for a particular model of CD player, the accountant for Co...

After analyzing sales figures for a particular model of CD player, the accountant for College Sound Company has produced the following graph relating the selling price P (in dollars) and the number y of units that can be sold each month at that price. For instance, as the graph shows, setting the selling price at $225 yields sales of 260 units per month.

(a) Find an equation of the line. (Remember to use the letter P instead of the usual x.)

(b) Use the equation that you found in part (a) to determine how many units can be sold in a month when the price is $303 per unit.

(c) What should the price be to sell 288 units per month?