Answer
G) $y=2x-10$
Work Step by Step
Convert the word problem into an algebraic expression for the total purchase price. Let x be the number of balloons Bill purchased. A coupon reduces the purchase price.
$\underbrace{each\ balloon\ costs\ \$2}\ \underbrace{\$10\ coupon}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2x\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ - 10\ \ \ \ \ \ \ \ \ \ \ \ =$ purchase price
If y is the purchase price:
$y=2x-10$
