Question 1130769


The equation {{{x=-2}}} represents a {{{vertical}}} line which crosses the {{{x}}} -axis at the point ({{{-2}}},{{{0}}}) . Every ordered pair with {{{-2}}} as its first coordinate is a solution . 

so, points are: 
({{{-2}}},{{{1}}})
({{{-2}}},{{{-1}}})

A vertical line has {{{undefined}}} slope because all points on the line have the same x-coordinate. As a result the formula used for slope has a denominator of{{{ 0}}}, which makes the slope undefined.