Question 53643
The formula for slope (m) when you're given two points (x1,y1), (x2,y2) is:
{{{m=(y2-y1)/(x2-x1)}}}
In your case: (x1,y1)=(0,0) and (x2,y2)=(3,9).  Substitute these values into the formula and you have:
{{{m=(9-0)/(3-0)}}}
{{{m=9/3}}}
m=3
Happy Calculating!