Let f(x) be a linear function with f(1) = 2 and f(3) = 8. Find f(5)

How do u solve it like the steps

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  1. f changes by 6 when x changes by 2, so the slope is 6/2 = 3.

    So, f(x) = 3x+b

    Since f(1)=2, b = -1

    f(x) = 3x-1

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  2. Would the answer be 16?

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  3. Cause if f(x)=3x-1
    F(5) would be 3(5)-1
    Which is 14
    But someone told me the answer was 16

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  4. someone might be wrong

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