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Every Graph Tells a Story

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Interpret Graphs A function is a relationship between input and output values. In a function, there is exactly one output for each input. The input values are associated with the independent variable, and the output values are associated with the dependent variable. Functions can be graphed without using a scale to show the general shape of the graph that represents the function.

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The graph represents the height of a football after it is kicked downfield. What is the independent and dependent variable. Describe what is happening in the graph. The independent variable is time, and the dependent variable is height. The football starts on the ground when it is kicked. It gains altitude until it reaches a maximum height, then it loses altitude until it falls to the ground.

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The graph represents the price of stock over time. Identify the independent and dependent variable. Describe what is happening in the graph. The independent variable is time and the dependent variable is price. The price increases steadily, then it falls, then increases, then falls again.

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The graph represents the height of a baseball after it is hit. Identify the independent and the dependent variable. Describe what is happening in the graph.

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The graph represents the balance of a savings account over time. Identify the independent and the dependent variable. Describe what is happening in the graph.

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B

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The outside temperature rises steadily to 85° at 3 p.m., then drops steadily to 65° at 8 p.m.

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What does it show? time

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Drawing graphs of real-life situations In your exams you may be asked to complete, or draw, graphs to represent given situations.

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Pick a graph and write a story about it!

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Commute to School Write your own story about your commute to school!

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http://www.nsa.gov/academia/_files/collect ed_learning/middle_school/pre- algebra/interpret_graphs.pdf http://www.nsa.gov/academia/_files/collect ed_learning/middle_school/pre- algebra/interpret_graphs.pdf

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1.8 Graphs and Functions A function is a relationship between input and output. In a function, the output depends on the input. There is exactly one output.

1.8 Graphs and Functions A function is a relationship between input and output. In a function, the output depends on the input. There is exactly one output.

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