Limits: 9-x as x Approaches 4 = 5

[Not An Einstein]

lim(9-x) as x->4 = 5
I thought I was supposed to do this:
9-4=5
5=5
But apparently I was supposed to use delta and epsilon?
I'm not sure how to find either of these. I know you find epsilon first but I'm really confused so if anyone knows just HOW to find it, that would be extremely helpful. Thank you.

 

[jedishrfu]

See the Khan Academy video on how its done:

https://www.khanacademy.org/math/di...roving-a-limit-using-epsilon-delta-definition

Also for future homework posts please post them in the homework section and use the homework template provided with the post so we can know your level of understanding.