Which postulate or theorem proves that these two triangles are congruent?

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c,with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

15 point ! ~ see if you know the answer to both you!

Solve the system of equations. y= 2x y= x^2 - 15