Anja buys gas for her car at $3 per gallon. Write an equation using two variables to show the relationship between the number of gallons of gas, g, and the total amount of amount she spends, s.
The equation using two variables that shows the relationship between the number of gallons of gas, g, and the total amount of amount she spends, s, is:
s = 3g
In this equation, "s" represents the total amount of money spent on gas, and "g" represents the number of gallons of gas purchased. The equation shows that the total cost of gas is calculated by multiplying the number of gallons purchased by the cost per gallon.