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Question 552940: What is the standard form of the equation for a vertical line?
Answer by KMST(5328)   (Show Source):
You can put this solution on YOUR website! In the standard equation for a generic line, make the coefficient of y zero, to make y disappear.
You could end up with  .
I would prefer  , because if they asked me for the equation of the vertical line that passes through the point (2/3,5) I would write  rather than  or  , or any of the infinity of other equivalent equations. Of course, if I knew that they wanted an answer with integer coefficients, I would write .
There are infinity of equivalent standard form equations for each line. If the line is not vertical, there is just one slope-intercept form. Unfortunately for a vertical line, there is no slope, and no slope-intercept equation.
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