Let's use the variable x to represent the number of gallons of gas Colin buys, and the variable y to represent the total cost.
The equation can be written as:
y = 4x
This equation represents the relationship between the number of gallons of gas and the total cost, where the cost of gas per gallon is $4.
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
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