The graph shows the ratio of pencils to pens sold at the school bookstore. Pencil and Pen Sales y 20 18 16 14 12 10 8 4 2 4 6 8 10 12 14 16 18 20 Number of Pencils If the bookstore sells 15 pencils, what is the ratio of pencils to pens sold written as a fraction? Number of Pens

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Equations and inequalities describe the relationship between two mathematical expressions.

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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.