The following ordered pairs are solutions to a linear equation: (-20, 11.5), (-21, 12), and (-22, 12.5).

which of the following graphs shows all of the ordered pairs in the solution set of this linear equation?

The generic equation of the line is:
 
 Where,
 m: slope of the line
 (xo, yo): ordered pair that belongs to the line
 The slope is given by:
 
 Substituting values we have:
 
 Rewriting we have:
 
 
 
 By choosing an ordered pair we have:
  Substituting values in the generic equation:
 
 Rewriting:
 
 
 
 
 the ordered pairs in the solution set of this linear equation is given by:
 Option A