Coordinate Geometry II HARD!!! 1a). TriangleABC has vertices A(4,6), B(-3,4) and C(-1,-3). Write down the three inequalities whose intersection is the interior of triangleABC. 1b). Prove that triangleABC is a right angled isosceles triangle. 2a). The lines L1 and L2 have the equations 3x-4y+15=0 and 2x+3y-6=0 and intersect at the point P. Write in terms of a constant k, the equation of an arbitrary line through P. (Do not solve the equations simultaneously). b). Given that the line through P, L3, also passes through Q(1,1) find the equation of L3. i'm not sure if anyone could do it, but im like SOOOO stuck on it and i don't even have a first step..please need help Thanks in advance.