Answer
$y=x+3$
Work Step by Step
Use the slope formula $m=\frac{y^2-y^1}{x^2-x^1}$ and the point-slope form $y-y_1=m(x-x_1)$ to solve this problem.
Passing through $(-3,0)$ and $(0,3)$
$\frac{3-0}{0+3}=1$
$y+0=1(x+3)$
$y=x+3$
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