Answer
$\frac{x}{3}+\frac{y}{3}=1$
Work Step by Step
Use the intercept form of the line.
$\frac{x}{a}+\frac{y}{b}=1$ (where intercepts are (a,0) and (0,b))
Put the given intercepts into the equation:
$\frac{x}{c}+\frac{y}{c}=1$
x+y=c
1+2=c
c=3
$\frac{x}{3}+\frac{y}{3}=1$