You need linear formulas for \(\displaystyle x\le 0\), \(\displaystyle 0< x\le 1\), \(\displaystyle 1< x\le 2\), and \(\displaystyle x> 3\). You are missing the middle two. What is the equation of the line through (0, 0) and (1, 2)? what is the equation of the line through (1,2) and (2, 1)?