First find the slope of the line, this can be done by selecting two clear points on the line and using 'slope = change in y / change in x':
Two points we can see are (0,1) and (4,4).
So the slope will be (4-1) / (4-0) = 3/4.
Next we'll look at the y intercept. This is where the line crosses the y axis (when x = 0). We can see from the graph that this is at y=1.
Now let's put this into an equation: y = 3/4x + 1
If you choose to, you can multiply the whole equation by 4: 4y=3x+4
