book Maths Puzzle Numerical Ability

Graph the linear system and estimate the solution.Then check the system algebraically.

2x+y=9
-x+6y=-1

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HEY! I would really appreciate help with this problem. Right now we're dealing with functions and graphs so I think it needs to be set up like that. It would help if you could put The points A(3,4), B(-6,-2) and C(5,1)are the vertices of a triangle on a graphic designers template.

Find the equation of the medin of triangle ABC from A(3,4)