Question

The total cost of gasoline varies directly with the number of gallons purchased. Gas costs $1.89 per

gallon. Write a direct variation to model the total cost c for g gallons of gas.

a. g = 1.89c b. c = g + 1.89 c. c = 1.89g d. c =

g

Answer 1

Here, (c)ost and (g)allons vary directly so we have:

c = k times g

And since we have the price per gallon, we have that "k" -> 1.89

So,

c = (1.89)(g)