An average of 400 iPods are sold every month at a certain store when the price of cach iPod is $150. For cach S10 increase in price, the average monthly sales fall by 20 units. Find the demand function. a) x+400 3 b) p=-x+350 c) p=-2x+950 d) p=--x+350 e) p=10x+150

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Equations and inequalities describe the relationship between two mathematical expressions.

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.