appser128
appser128
21-08-2017
Mathematics
contestada
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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