



 
Hi Alex, Think about the graph of the vertical line through (6, 2).
The xcoordinate of every point on the graph is 6. Furthermore if a point in the plane is not on the graph then its xcoordinate is not 6. Hence a point (x,y) in the plane is on the graph if and only is x = 6. Thus the equation of the vertical line through (6, 2) is
Penny  


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