Question 763271
Suppose f(x) is a linear function with slope -3 and f(x)=5. Find x.

Possible answers : a. -3x+5
                   b. -3x+11
                   c. -3x+2
                   d. -3x+7
                   e. -3x+13 
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All of a thru e have a slope of -3
None of them are f(x) = 5
f(x) = 5 has a slope of zero.
It's not possible to find x.