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