Question 123928
Solve both equations for s:

{{{s=-mx-7}}} and


{{{s=-(2/7)x+2/7}}}


In order for there to be no unique solution, the slopes of the two lines must
be identical, that is {{{m = -2/7}}}.  Since the intercept values are different,
the system is inconsistent, that is these are parallel lines that do not intersect.