Now this line will intersect with both equations 5x-12y+33=0 and 5x-12y-6=0. So you want to find the points of intersection. From there, simply use the distance formula to find the distance between the two points of intersection. I hope that's enough to get you started.
You can put this solution on YOUR website! D=sqrtformula (x^2-x^1)^2+(y^2-y^1)^2
d= (5x^2-5x^1)^2+(-12y^2-12y^1)^2
d= (25x-5x)^2 + (144y-12y)^2
d= (20x)^2 + (132y)^2