Colin buys gas for her car at $4 a 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,
Let's write an equation to represent the relationship between the number of gallons of gas, g, and the total amount of money she spends.
First, we need to determine the total amount of money Colin spends on gas. This can be calculated by multiplying the number of gallons of gas (g) by the cost per gallon ($4).
The equation would be: Total amount spent = g * $4
Therefore, the equation is: Total amount spent = 4g