1) Find an equation of the line that has slope −4 and passes through the midpoint of the line segment joining the points
P1(−4, −3) and P2(5, 5) . (Let x be the independent variable and y be the dependent variable.)
2) The quantity demanded x for a certain brand of MP3
players is 300 units when the unit price p is set at $100.
The quantity demanded is 1300 units when the unit price is $60.
Find the demand equation.
p =
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