Find parametric equations to describe the line 3x+ 4y= 12. Use your equations to find coordinates for the point that is three-fifths of the way from (4, 0) to (0, 3).

I can find the parametric equations to describe the line 3x+ 4y= 12. I am having trouble using the equations to find coordinates for the point that is three-fifths of the way from (4, 0) to (0, 3).