Answer True or False $\theta$ , Is Changing with Respect to Time, D

Answer true or false. A plane is approaching an observer with a horizontal speed of 140ft/s and is currently 7,000ft from being directly overhead at an altitude of 12,000ft. The rate at which the angle of elevation, $\theta$ , is changing with respect to time, d $\theta$ /dt = (1/x)dy/dt. Where x is the horizontal distance and y is the altitude.