Question

Molly paid $1,636.80 for a used car. If the price paid includes a 7% discount, which of the following equations can be used to determine the price of the car before the discount?(Let x represent the cost of the car and y represent the total cost before the discount.) A. y = 1.7x B. y = 1.07x C. y = x + 7x D. y = 0.93x

Answer 1

B) y=1.07x

1) Gathering the data

$1636.80 (used car) with a 7% discount paid

2) To determine the price of that car without a discount, let's write 7% as a decimal number

7%=0.07

And add 0.07 to 1. Like this 1 +0.07 = 1.07

Then we can write:

1.07($1636.80)=1751.38

Writing this as a function

y=1.07x

Where x, is the discounted price. And y the price before the discount.