2. The vertex with the right angle is the origin of the coordinate system.
3. The median is the straight line which connects the vertex B (that's where the right angle is located) and the midpoint of .
4. Determine the coordinates of the midpoint of . You should come out with
5. Now determine the equation of the line passing through the origin and the M.
6. Draw this line into the sketch of #1 and check if your calculations are OK.