exam Maths Puzzle Numerical Ability

I am having a hard time with a basic proof...I need to prove a triangle AGC is Isosceles.
Line GB is equal and congruent to line GD
angle BGE is equal and congruent to angle DG

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exam Other Question

Sketch the graph of the ellipse (x-3)^2/49 + (y+2)^2/9 = 1. Lavel amd find the coordinates of the four vertices of the ellipse. The center of the ellipse is (3,-2). These are two problems, that I do not get!

Your suppose to graph a line for both of them.

3x+2y=-6

and y=-3x-1 can you help me figure these out..thanks