Let's pick two points on the line, the y-intercept, and the x-intercept. These are the points at which x=0, and y=0. When x=0:
So one point is (0,6)
When y=0:
So another point is (10,0)
So mark the points (0,6) and (10,0) on a pair of axes, and draw a straight line between them, and past them to infinity. This is a graphing of the line y=-3/5 x + 6