Answer
$y=\frac{1}{3}x+\frac{4}{3}$ or $x-3y=-4$
Work Step by Step
Step 1. Given two points $(-1,1),(2,2)$, we can find the slope $m=\frac{1-2}{-1-2}=\frac{1}{3}$.
Step 2. Using either point (2nd point used here), we can write the equation as $y-2=\frac{1}{3}(x-2)$ or $y=\frac{1}{3}x+\frac{4}{3}$ or $x-3y=-4$
