1. The problem statement, all variables and given/known data Let f(x,y)=2x+3y. Let [tex]\epsilon[/tex] be any positive number. Show that there is a disk with center (1,1) such that whenever P is in that disk, [tex]|f(P)-5|< \epsilon[/tex]. (Give [tex]\delta[/tex] as a function of [tex]\epsilon[/tex].) 2. Relevant equations None. 3. The attempt at a solution Um, I tried to rewrite stuff in a form that's needed, but I can't really get anything. My trouble with these problems is setting everything up and then rearranging it cleverly to get what we need.