Difference quotient (i know this is right) but it is telling me otherwise

AI Thread Summary
The discussion revolves around calculating values for the function f(x) = 2 - 5x, specifically f(a), f(a+h), and the difference quotient. The user expresses frustration with an online homework system, Webwork, which indicates that their answers for f(a) and f(a+h) are incorrect due to an undefined variable 'x'. Despite feeling confident in their calculations, they encounter issues when submitting their answers. The user also mentions an unhelpful response from their professor regarding the problem. Ultimately, they indicate that they have resolved the issue on their own.
ihatecats2014
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Homework Statement



Given the function , calculate the following values f(x) = 2-5x
f(a)
f(a+h)
f(a+h)-f(a)/h

The Attempt at a Solution



f(a)= 2-5x
f(a+h)= 2-5(x-h)
f(a+h)-f(a)/h = -5

i am 100% sure but the darn computer is telling me that f(a) and f(a+h) is wrong.
my calc professor is using webwork which is super stupid. it is telling me : " Variable 'x' is not defined in this context" how am i suppose to put in the answer if i already have it?
i emailed my professor, but she was unhelpful stating something totally unrelated, and it is due tomorrow i need help please
 
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never mind i got it.


ihatecats2014 said:

Homework Statement



Given the function , calculate the following values f(x) = 2-5x
f(a)
f(a+h)
f(a+h)-f(a)/h



The Attempt at a Solution



f(a)= 2-5x
f(a+h)= 2-5(x-h)
f(a+h)-f(a)/h = -5

i am 100% sure but the darn computer is telling me that f(a) and f(a+h) is wrong.
my calc professor is using webwork which is super stupid. it is telling me : " Variable 'x' is not defined in this context" how am i suppose to put in the answer if i already have it?
i emailed my professor, but she was unhelpful stating something totally unrelated, and it is due tomorrow i need help please
 

Thread 'Family of lines that are at a distance of 5 from the origin'

I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
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