what is the formula if the inputs are 15,16,17,and 18 and the output is 2,4,6,and 8?

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  1. call the inputs x and the outputs y.

    Each time x increases by 1, y increases by 2.

    So, y = 2x + ...
    Since x starts at 15, but y starts at 2*1, we can say

    y = 2(x-14) = 2x - 28

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  2. Steve, that was very clever!

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