- #1
rhololkeolke
- 7
- 0
Homework Statement
The problem is to either find the limit or show that it does not exist [tex]lim_{(x,y)\rightarrow(2,-2)}\frac{4-xy}{4+xy}[/tex]
I've been able to do similar problems to this such as
[tex]lim_{(x,y)\rightarrow(0,0)}\frac{xy}{x^2+y^2}[/tex] where I took two different paths to the limit and found that they were not equal and so it didn't exist. However, for this one I can't seem to pick a function that gives me a limit that exists let alone two functions that give me two different limits.
I've tried coming from the following paths for the problem
[tex]y=-x[/tex]
[tex]y=x-4[/tex]
[tex]y=-2[/tex]
[tex]y=x^2-6[/tex]
[tex]x=2[/tex]
No matter which one I do I can't seem to get anything to cancel out in order to simplify it to one that I can perform the limit on. Are there two functions that I can use to get this limit and how would I find these. If there aren't then how would I prove that this limit exists?