Question

You drive a car that holds 15 gallons of gasoline. Your car uses 0.03 gal per mi. Which equation best represents this information?

A. y = 0.03x + 15
B. y = 0.03x - 15
C. y = -0.03x + 15
D. y = -0.03x - 15

Answer 1

It's A. Do you need an explanation?

Answer 2

`y=-0.03x+15`

Explanation:

A car holds 15 gallons of gasoline.

We are also given that car uses 0.03 gallons per mile

Let x be the distance travelled by car

So, car uses gasoline for x miles = 0.03x

After using 0.03x gallons of gasoline

Remaining amount of gasoline = 15-0.03x

Let y be the amount of gasoline remaining in car after travelling x miles

⇒
`y=15-0.03x`

Thus the equation best represents this information is
`y= -0.03x+15`

Hence Option C is correct.