A
Step-by-step explanation:
Slope is change in y over change in x. Using the two points:
![\frac{3-2}{3-0}](/tpl/images/2144/1789/c56ee.png)
The slope is 1/3. This rules out B and D.
Let's put what we know into y = mx+b form.
![y=\frac{1}{3}x+b](/tpl/images/2144/1789/3996c.png)
Use any of the two points and substitute into the equation, I will use (3,3):
![3=\frac{1}{3}\left(3\right)+b](/tpl/images/2144/1789/aa225.png)
![1+b=3](/tpl/images/2144/1789/6f469.png)
b = 2.
Plug back into equation to get:
![y=\frac{1}{3}x+2](/tpl/images/2144/1789/46077.png)
Which is A.