Willis analyzed the following table to determine if the function it represents is linear or non-linear. First he found the differences in the y-values as 7 - 1 = 6, 17 - 7 = 10, and 31 - 17 = 14. Then he concluded that since the differences of 6, 10, and 14 are increasing by 4 each time, the function has a constant rate of change and is linear. What was Willis's mistake?

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15 January, 16:38

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He use differences 6 10 14 instead of 7 17 31 y values should have constant change