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**Graphs of Functions (Section 3.2, pp. 224-232)**

Activity 24: Graphs of Functions (Section 3.2, pp )

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Graphing Functions: If f is a function with domain A, then the graph of f is the set of ordered pairs In other words, the graph of f is the set of all points (x, y) such that y = f(x); that is, the graph of f is the graph of the equation y = f(x).

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Example 1: Sketch the graph of the function x y 1 1 4 2 9 3

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**Obtaining Information from the Graph of a Function:**

The values of a function are represented by the height of its graph above the x-axis. So, we can read off the values of a function from its graph. In addition, the graph of a function helps us picture the domain and range of the function on the x-axis and y-axis as shown in the picture:

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**Example 2 (Hurdle Race):**

Three runners compete in a 100-meter hurdle race. The graph depicts the distance run as a function of time for each runner. Describe in words what the graph tells you about this race. Who won the race? Did each runner finish the race? What do you think happened to runner B? Runner B started out first then stopped during which time runners A and C passed B. Runner A Yes Maybe stopped to tie the shoe laces!

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**Example 3: The picture shows the graph of**

From the graph, find the domain and range of g. Find g(4) = g(−2) = If g(x) = −2, what is x? -5 < x < 5 or [-5,5] -1 -2.5 x = 3 and -3

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**Graphing Piecewise Defined Functions:**

A piecewise defined function is defined by different formulas on different parts of its domain. As you might expect, the graph of such a function consists of separate pieces.

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Example 4: Sketch the graph of the piecewise function

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**Example 5: Step functions occur frequently in real-world examples.**

The greatest integer function is one of them; sketch its graph: [[x]] = greatest integer less than or equal to x

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y is a function of x We say that y is a function of x if for each x there corresponds a unique y. That is if the graph passes the vertical line test then y is a function of x. What line test must the graph pass in order for y to be a function of x? Horizontal line test y is a function of x y is not a function of x

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Example 6 Determine which of the curves drawn below is the graph of a function of x. y is a function of x y is not a function of x x is not a function of y x is a function of y

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y is a function of x y is not a function of x x is not a function of y x is a function of y

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Example 7: Which of the equations that follow define y as a function of x? This is a parabola so yes y is a function of x If we put in x = 4 then we have So y = 2 and y = -2. Consequently, y is not a function of x This is a circle so no y is not a function of x

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Bellwork: Graph each line: 1. 3x – y = 6 2. Y = -1/2 x + 3 Y = -2

Bellwork: Graph each line: 1. 3x – y = 6 2. Y = -1/2 x + 3 Y = -2

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