The total cost of gasoline varies directly with the number of gallons purchased...

Question

The total cost of gasoline varies directly with the number of gallons purchased. Kathy pays $17.93 for 11 gallons of gasoline. Which equation shows the relationship between the total cost of gasoline, c, and the number of gallons purchased, n?

Answer 1

The cost of gasoline = c

The cost of gasoline = no of gallons x cost per gallon

 

The cost per gallon = $19.63 / 11 gallons = $1.63 per gallon

 

if n is the number of gallons, then c = nx1.63

 

the equation the represents the relationship between no of gallons and cost is 

 

c = 1.63 n