1. The problem statement, all variables and given/known data Say I have line, y = - 5 in cartesian coordinates. How do I express this in cylindrical coordinates? Also, if I have a point (0,-5) in cartesian coordinates, how to I express this position vector in cylindrical coordinates? 2. Relevant equations y = r sin (phi) j = r(hat)cos (phi) - phi(hat) sin (phi) 3. The attempt at a solution THe relations are right there but I've forgotten howto use them.