You fill your car with 15 gallons of gas at a cost of $45. Using fractional notation, how do you write a proportion that shows how much 5 gallons of gas will cost? Use x

Question

to represent the unknown cost.(1 point)
Responses

15/45=x/5

15:45::x:5

15/45=5/x

15/x=45/5

Answer 1

To write a proportion that shows how much 5 gallons of gas will cost (using \( x \) to represent the unknown cost), you can use the first option:

\[ \frac{15}{45} = \frac{x}{5} \]

This proportion compares the amount of gas to its cost for both cases: the 15 gallons for $45 and the 5 gallons for \( x \).