1. The problem statement, all variables and given/known data If f(x) = 3x+1 en assume δ > 0. Assume ε>0. Give a δ > 0 with the following property : |x-1|< δ => |f(x) - f(1)| < ε 2. Relevant equations 3. The attempt at a solution |f(x) - f(1)| < ε <=> |3x+1-(3*1+1)| < ε <=> |3x-3| < ε <=> |x-1| < ε/3 |x-1| < δ |x-1| < ε/3 => δ=ε/3>0 What am I doing wrong? Thanks in advance!