Question 766278
Q:
p=(6,7); slope undefined
Graph the line containing the point P and having slope m. 
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A:
The slope of a vertical line is undefined.
Here's the graph of a vertical line  passing through the point P(6,7).
{{{drawing(400,400,-9,9,-9,9,grid(1),blue(line(6,-9,6,9)),locate(6,7,"P"))}}}
The equation of the vertical line is {{{highlight(x = 6)}}}.