Question 51589
The slope of any line showing only a scalar for y is 0 and graphs to a horizontal line:  {{{graph(200,200,-5,5,-5,5,-3)}}}.  To solve algegraicly, the slope m of a line is defined as {{{m=(Y2-Y1)/(X2-X1)}}}.  Because the values of y are always the same, the numerator equates to 0, which means the slope m is 0.