It costs $140 to buy a cord of firewood, delivered to your house, and $80 to buy one-half cord, delivered. Assume that you pay a certain number of dollars per cord for the wood, plus a fixed number of dollars for delivery. How much do you pay per cord and how much for delivery? 13. = X Equations:

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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.