Question

It costs $57.19 to fill up a 19 gallon gas tank and $54.18 to fill up an

18 gallon tank.

What is the constant of proportionality that relates the cost in dollars,
y, to the number of gallons of gas, x?

Answer 1

y=3.01x

Explanation:

We can see that since 19 gallons cost $57.19 and 18 gallons cost $53.18, 1 gallon (19-18) must cost $3.01.

Therefore, y=3.01x

You can check this with algebra