Let y be the total amount of money Colin spends on gas and g be the number of gallons of gas she buys.
Since the price of gas is $4 per gallon, the equation for the total amount spent on gas, y, is given by:
y = 4g
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
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