Yeah I plan on having that in my bound reference for exam 2. Do you think they could ask that for exam 1?
Its very possible, since it wasn't too difficult to get the gradient in terms of k using hand-algebra. EDIT: I don't mean the question was easy, I mean the algebraic manipulation wasn't particularly challenging after you equated the gradients, which was the hardest part of the question to do.
Having said that, they would definitely lead you on more (ie, find the derivative of the 1st curve, find the gradient of the line in terms of ___, hence find the gradient in terms of k) OR it would be a show-that question, since the questions following that one were far easier to do if you had the answer and unnecessarily cut of students who were capable of evaluating them who couldn't find the gradient.