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Mathematics 13 Online
OpenStudy (anonymous):

C) The intensity decreases by the same amount of 3 lumens every meter. The difference in the y value is the same for every meter along x. The slope is constant and therefore this is a linear function and not an exponential function. f(x) = 1200 - 3x or f(x) = -3x + 1200 is the function.

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