why the line x = 4 is a vertical line.

Question

Name three points on the line represented by x=4. Then explain why, when we connect these points, the line goes straight up and down and does not slant to the left or right.

Is the three point becasue on a graph we have -4 =4 on a graph twice and x + 4 a vertical line because x = 0

Answer 1

Three (x,y) points on the x=4 line could be
(4,0), (4,1) and (4,8) . You could also add (4,any other number)

When you draw a line through these points, it goes straignt up and down, because the x value is always 4.