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Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Matt wants a snack. He finds a vending machine with 25 different snacks. Each one is labeled with a letter (A to E), and then a number (1 to 5). He decides he wants the chips in slot A5. 1. Matt puts in his money and pushes the A button. A. Does the vending machine know what he wants yet? B. Explain. 2. Then Matt pushes the 5 button. What does that tell the machine to do? Gizmo Warm-up Input Output In the Introduction to Functions Gizmo, you can create and analyze relations. A relation is a set of (input, output) or (x y) ordered pairs. The Gizmo gives you three ways to link input values to output values, to form these pairs. 2 1. In the Gizmo, turn on Show mapping diagram and Show ordered pairs. 3 In the mapping diagram, click-and-drag an arrow from the red 3 to blue 1, as shown to the right. This means, "For an input of 3, the output is 1." 4 A. How is this expressed as an ordered pair? 5 B. Turn on Show graph. How is this relationship shown on the graph? 2. Drag another point onto the graph. A. What ordered pair did you graph? B. How is this ordered pair shown on the mapping diagram? C. Express this relationship as a sentence: For an input of _the output is