However, you need to solve for k to get a complete picture of the relationship. And you haven't given enough information to be able to solve for k. Your problem statement probably says y = 175 when x equals something. Your next step would be to substitute 175 for y and whatever was given for x, then solve for k. After that, you can set up the relationship with the calculated value of k, substitute x = 10 and determine the value of y.