Okay a higher maths question, i have no idea what to do. So any help is greatly appreciated espacially since my maths teacher strongly dislikes me.

In the diagram triangle ABC is isosceles with AB=AC. A is the point (-5,5), B is (-3,-6) and theequation of the line BC is y-2x. M is the midpoint of BC.

1.Find the equation of the AM (4)
2.Hence establish the coordinates of the point M (2)
3.Find the coordinates of the point C (2)

M is apposite A. AB is parrelell to AC

-The triangle is below-

Sorry for posting this twice. I'm just stuck on this and it's something i "should" know