Heather paid $1,493.30 for a computer. if the price paid includes a 9% sales tax, which of the following equations can be used to determine the price of the computer after tax? (let x represent the cost of the computer and y represent the total cost after tax.) a. y = 1.09x b. y = 0.91x c. y = 1.9x d. y = x + 9x