During one month, the cost for renting a car in Mobile, Alabama was $68.22 per day plus 25 cents per mile. For a one day rental, let x denote the number of miles driven and let y denote the total cost, in dollars. Find the equation that expresses y in terms of x, find the total cost when car is driven 150 miles, and determine how many miles were driven if the cost of renting a car is $70.22.

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.