Unit 5 Function Test Review

What is the definition of function?

• Has inputs and outputs
• Every input has only ONE output
• Inputs have different outputs every time
• x-values and y-values

Choose the best situation for the graph.

• A car is moving at a constant speed for several minutes. When it approaches a red light, it slows down and comes to a stop.
• A plant grows steadily and then has a growth spurt during the rainy season. It remains the same height for a while and then grows steadily again.
• A family buys a fish tank and some fish. After two weeks, they buy some more fish. After two more weeks, they buy even more fish.
•  A monkey swings from a high branch to a lower branch. He climbs along the branch. Then he jumps to a higher branch and takes a nap.

Write 2x+y=24 in slope-intercept form.

• y = 2x-24
• y = -2x+24
• y = 1/2 x + 24
• y = -1/2 x + 24 

Would x = 7 be considered a function even though it graphs a line? 

• Yes.
• No. 

Which graph represents a function?

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Which table does NOT represent a function?

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Determine whether the relation shown here is a function. Explain your answer.

• function, an input has 1 output

• function, an input has 2 different outputs

• function, no output has 2 different inputs

• not a function, an input has 2 different outputs

Which equation matches the table?

• y = x - 3

• y = x + 3

• y = 4x - 3

• y = 4x + 3

The cost of Nate’s service is described by y = 4x + 6. The table shows the cost of Beth’s service. Which service is cheaper for 8 movies in one month?

• Beth's service ($38 vs. $40) is cheaper
• Nate’s service ($42 vs. $44) is cheaper
• Nate’s service ($38 vs. $40) is cheaper
• Beth's service ($42 vs. $44) is cheaper

Which function has the GREATEST rate of change?

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