Write a function rule for a graph EXAMPLE 3 Write a rule for the function represented by the graph. Identify the domain and the range of the function.

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Presentation transcript:

Write a function rule for a graph EXAMPLE 3 Write a rule for the function represented by the graph. Identify the domain and the range of the function. SOLUTION STEP 1 Make a table for the graph. x12345 y23456

Write a function rule for a graph EXAMPLE 3 STEP 2 Find a relationship between the inputs and the outputs. Notice from the table that each output value is 1 more than the corresponding input value. STEP 3 Write a function rule that describes the relationship: y = x + 1. A rule for the function is y = x + 1. The domain of the function is 1, 2, 3, 4, and 5. The range is 2, 3, 4, 5, and 6. ANSWER

GUIDED PRACTICE for Example 3 Write a rule for the function represented by the graph. Identify the domain and the range of the function. 3. ANSWER y = 5 – x ; domain: 0, 1, 2, 3, and 4, range: 1, 2, 3, 4, and 5

GUIDED PRACTICE for Example 3 Write a rule for the function represented by the graph. Identify the domain and the range of the function. ANSWER y = 5x + 5 ; domain: 1, 2, 3, and 4, range: 10, 15, 20, and 25 4.