Prisca: f(x)=1/2x-6 find x such that f(x) is not defined
For starters, this is your actual function
f(x)=1/2x-6
f(x)=(1/2)*x-6
f(x)=x/2 -6
and this function is a line that is defined for all x
I think the function that you really want is
f(x)=1/(2x) -6
Now, 2x is the denominator of the fraction. (what you are dividing by)
what can you not divide by? There is only one number that you can't divide by because it makes no sense.
If you can answer that question then you will know what x cannot be
+118654 
