Very important! 50 points and brainiest to first !

a company manufactures and sells video games. a survey of video game stores indicated that at a price of $71 each, the demand would be 200 games, and at a price of $31 each, the demand would be 1,000 games. if a linear relationship between price and demand exists, which of the following equations models the price-demand relationship?

a) y= 20x
b) y= 20x - 1,220
c) y= -20x + 1,620
d) y= -20x + 1,220