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This is my first time posting here, so if I do anything wrong, just tell me. :)

On to the question.

Alright, this question came in 3 parts. I've done the first 2 parts but have no clue on doing the third part. There are two equations (below) and a constant k.

Relevant equations and data:

.Curve: xy=12

.Line 'l': 2x+y=k

.k=10

.One of the points of intersection is P(2,6).

The task is to find the angle (in degrees) between 'l' and the tangent to the curve at P.

I really don't have any idea on how this is to be done. Maybe there's some formula that must be followed but I don't know what it could be.

Thanks for any help. :)