How do I graph x=1.

Make a table of points.  Since the letter y does not
appear in the equation, the choices for y is
arbitrary,  so we can choose any number for y. However
there is only one number that can be chosen for x, and
that is 1 because the equation is x=1.

So make this table:
 x | y
-------
 1 | 7
 1 |-2
 1 | 1
 1 | 4
 1 |-6

Plot those points and you get:

  
 
Now draw a straight line through them.
As you see you get a vertical line.



The graph of "x = (a number)" is always
a vertical line which is that number of units
away from and parallel to the y-axis.

The graph of "y = (a number)" is always
a horizontal line which is that number of units
away from and parallel to the x-axis.

Edwin