Our topic is Formulas and Applications of Rational Equations. Please help me understand how to write and solve the following problem involving motion. Thank you. The cost of a train ticket varies directly as the number of miles, M, of the trip. A 400-mile trip costs $180.  What is the cost of a 360-mile trip?

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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.