Answer
$y=2x+4$
Work Step by Step
Use the points $(2,1)$ and $(3,3)$.
Slope:
$m=\dfrac{1-3}{2-3}$
$m=\dfrac{-2}{-1}$
$m=2$
Slope-form:
$y=mx+b$
$1=2(2)+b$
$1=4+b$
$-3=b$
The other equation would have the slope $2$ and the point $(0,4)$
$y=mx+b$
$4=2(0)+b $
$4=0+b$
$4=b$
The equation would be $y=2x+4$