The cost of renting a car is $35/wk plus $0.25/mi traveled during that week. An equation to represent the cost would be  y = 35 + 0.25x,  where x is the number of miles traveled. If your cost was $56.25, how many miles were you charged for traveling?

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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.