we have

This is the equation of the line in standard form
so
The graph is a straight line
we are going to proceed to verify the first two cases only
case A) It is a straight line joining the points
,
, and

Using a graphing tool
The three points are on the straight line
see the attached figure N
case B) It is a straight line joining the points
,
, and

Using a graphing tool
The three points are not in the straight line
see the attached figure N
therefore
the answer is
It is a straight line joining the points
,
, and
