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← Interpreting Graphs of Linear Equations

Concept

Linear Function

A linear function is a function with a constant rate of change. A linear function can be represented by a linear equation in two variables. Graphically, a linear function is a nonvertical line.

Using that line, the rate of change can be determined by finding the horizontal change $Δ x$ and the vertical change $Δ y$ between any two points on the line. Any function whose graph is not a straight line cannot be linear.

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