First we need to know the point slope form. It is y - y1 = m(x - x1). In the y1 and x1 spots, you just plug in any coordinate on the line.
m would be the slope which we already know as 5/3.
We are given the coordinate point (0,3) as a point on the line. This is also what we are going to plug into the equation. 0 will be x1 and 3 will be y1.
Our equation should then look like after plugged in as....
y - 3 = 5/3(x)
x is by itself because subtracting or adding by 0 yield the original number.