1. ABC has coordinates A(3, -1), B(7, -4) and C(11, 6). What is the equation of the median that contains vertex A?

2.XYZ has coordinates X(8, 3), Y(-3, 7) and Z(-1, -1). What is the equation of the altitude drawn from vertex X?

3.DAN has coordinates D(-4, 0), A(3, 5) and N(8, -2). Determine if DAN is a right triangle.

4.ABC has coordinates A(-2, 3), B(10, 3) and C(4, 1). Prove that ABC is an isosceles triangle