I am hoping someone can help me to solve this problem.

In the xy-plane, a particle moves along the parabola y = x^2 - x with a constant speed of 2 times the square root of 10, units per second. If dx/dt is greater than 0, what is the value of dy/dt when the particle is at the point (2,2)? The answer is 6, but I do not know how to get there. Thanks in advance for your help.