Question

Katrina has $210 in her savings account. She plans to buy books for her friends for Christmas. The books cost $7 per book. Which equation best represents this situation? Let y represent the amount of money in Katrina's account and x represents the number of books she purchases.

what is the correct answer
y=210-7x
y=7x+210
y=210x+7
y=-7+210x

Answer 1

Y=210-7X you have $210 and want to know how many books she can buy with that money.

Answer 2

Option 1 y = 210 - 7x

Explanation:

Since she will be buying "x" amount of books she will lose money because she has to pay for them. Each book costs $7 so if she buys "x" books she will lose 7x dollars. Therefore the right equation would be...

y = 210 - 7x (which is the first option)