SOLUTION: if, f(x)=9-3x for what value of x does f(x)=12

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Question 1114174: if, f(x)=9-3x for what value of x does f(x)=12
Answer by ikleyn(52781) About Me  (Show Source):
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If f(x) = 9 - 3x  and  f(x) = 12,   it means


9 - 3x = 12,


9 - 12 = 3x


-3 = 3x  ====>  x = %28-3%29%2F3 = -1.


Answer.  x = -1.