All computers are on sale for 10% off the original
price.
if x is the original price of the computer, then the
function that represents the price after only a 10%
discount is:
p(x) = x -0.1x
p(x) = 0.9x
the function that gives the price, c, if only a $150
coupon is used is:
c(x) = x - 150