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Pre-Algebra: Lesson 126

Graphing
Evaluating and Graphing Functions

Lesson Description

Students learn that function notation, or f(x) notation, shows that y is a function of x in a given equation. In other words, the value of y depends on the value of x. For example, the equation y = x + 1 can be written in function notation as f(x) = x + 1. Students are then asked to find the value of a function for specific values of x. For example, to find f(5) for the function above, substitute a 5 in for the x, to get f(5) = (5) + 1, or f(5) = 6. Students are also asked to graph a given function using a t-chart to find a set of points, then a coordinate system to graph the function.

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