The number of calories, c, burned while walking is directly proportional to the distance, d, a person walks.  Tom burned 180 calories walking a distance of 2 miles.  Which equation represents the relationships? A.c = 90d B.d = 90 + c C.c = 180 + d D.d = 180c

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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.