Exercise 13.  Show that the equation of the line through the points   and   can be expressed in the form  , where t is a real number.

Solution 13.

See text and/or instructor's solution manual.

This is simply an equivalent form of the vector equation between the points   and .  That is  

          

This solution is complements of the authors.

(c) 2008 John H. Mathews, Russell W. Howell