Question 156500
Write equations for the vertical and horizontal lines passing through the point (9,1) in (x,y) coordinates. 
vertical line=
Horizontal line =
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It will be less confusing if you draw the picture.
Plot the point (9,1) on a coordinate system.
Draw a vertical line thru the point.
Do you see that the line passes thru ALL the points where x=9 ?
The equation of that vertical line is x=9
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Draw a horizontal line thru the point.
Do you see that the line passes thru ALL the points where y = 1 ?
The equation of that horizontal line is y = 1
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Cheers,
Stan H.