I'm learning about graphing proportional relationships

To solve for slope we want to use the formula (y2-y1)/(x2-x1)

We can use any two points on the graph to solve for the slope, so you can choose at random. 

The points we'll use are (2,1.2) and (0,0)
We can then plug the values into the formula

(0-1.2)/(0-2)

1.2/2=.6

So the slope of the graph is .6x

y=.6x

I'm gonna have to say about 13 percent