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- Homework Statement
- A triangle in the plane is formed by straight lines

##\left.\begin{matrix}

2x+y=2\\

2x+3y=6\\

x-y=1

\end{matrix}\right\}##

Which of the points P(1,1) and Q(1,2) lie in the interior of the triangle and which outside the triangle?

NOTE: No drawings or sketches are allowed as part of the solution.

- Relevant Equations
- .

I tried doing this problem, but couldn't find a solution that wouldn't involve a sketch... Finding the vertices was all I've got.

Thanks in advance.

Thanks in advance.