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30 March, 18:21

Harrison uses a gift card to buy only coffee at at a coffee shop. The gift card starts out with $20. The function y = 20 - 2x represents the amount of money (y) still left on the gift card after purchasing (x) cups of coffee. Identify the x-intercept and describe its meaning in this scenario.

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  1. 30 March, 18:50
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    x-intercept is 10. It means when you buy 10 cups of coffee you run out of money

    Step-by-step explanation:

    The x-intercept happens when y = 0

    so

    0 = 20 - 2x

    solving for x we get

    2x = 20

    x = 10

    so when you buy 10 cups of coffee you run out of money
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