Question

A company manufactures and sells mini-recorders. A survey of office supply stores indicated that the demand for 4 hundred recorders would cause them all to be sold if they cost $102 each, and the demand for 14 hundred recorders would cause them all to be sold if they cost $42 each. If a linear relationship between demand and price exists, which of the following equations models the demand-price relationship?

(Let x represent the demand in hundreds and y represent the price per mini-recorder.)