The amount of money that Devon pay for additional mileage if he paid a total of $421 for the car rental is $43
An equation is an expression that shows the relationship between two or more numbers and variables.
Independent variables represent function inputs that do not depend on other values, while dependent variables represent function outputs that depends on other values.
Let y represent the amount paid for additional mileage. He rented the car for 7 days at a rate of $54 per day. Hence:
54(7) + y = 421
y = $43
The amount of money that Devon pay for additional mileage if he paid a total of $421 for the car rental is $43
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