One brand of motorcycle uses an oil-to-gasoline ratio as shown in the graph. The amount of oil that should be adde- varies directly with the amount of gasoline. -16 12 Amount of Gasoline (gal)" Write a direct variation equation that describes the relationship. Then use your equation to determine the amount of that should be added to 6.5 gallons of gasoline. Amount of Oil (6z)

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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.