1. Given the vertices of the triangle ABC: A (x1, y1), B (x2, y2), C (x3, y3). Search:
  a) side of the equation AB
  b) the height of the equation CH
  c) The median equation AM
  d) the point of intersection of the median N AM and height CH
  e) The equation of the line passing through the top with parallel sides AB
  e) the distance from the point C to the line AB

  1.5 A (1, -2) B (7, 1) C (3, 7)

2. Solve the following problems.
  2.5 Find the equation of the line passing through the point A (2, -3) and the point of intersection of 2x - y = 5 and x + y = 1

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