write the equations of the vertical line through the point (6-1)

Question

I need help solving this

Answer 1

For the point (6, -1) in a 2-dimensional (x & y) plane,

there would be one possible line through (6, -1) that

could be called "vertical" (that is to say, parallel to or

never crossing the y-axis).

One can express this line by simply writing x = 6; all points 

with x equal to 6 will fall on the vertical line sought; the value

of y here can be any "real" number --- positive, negative, or zero.