appser128 appser128

21-08-2017
Mathematics

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What is the inverse function of f(x)=-3x+21

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mreijepatmat mreijepatmat

21-08-2017

f(x) = - 3x + 21.
y = - 3x + 21.

just replace x with y and y with x:

x = - 3y +21; now isolate y :

-3y = x - 21
3y = -x + 21
y = (-x+21)/3

f⁻¹(x) = (-x+21)/3

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