Discussion





The set of points that forms the line  is every point that has an

x-coordinate of -7 paired with every possible real number value for y.  The

slope of a line is given by .  But in the equation

 the x-coordinate for any point on the line is -7.  That means that

the denominator of the slope calculation is 0, therefore the slope is

undefined.  Since x = -7 no matter what y is, this line never crosses the

y-axis.  There is no y-intercept because the line is vertical and therefore

parallel to the y-axis.  



 

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