The system has the solution (3, –1), where F, G, H, P, Q, and R are nonzero real numbers.
Select all the systems that are also guaranteed to have the solution (3, –1).

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.