Which of the following is true of (1,4) and (1, -7)? The points lie on a horizontal line. The points lie on a diagonal line. More information is needed to determine the relationship between the two points. The points lie on a vertical line.
If two points have the same x coordinate, both lie on the same vertical line. In this case (1,4) and (1,-7) have the same x coordinate, that is 1. It means they lie on the vertical line x=1. The right answer is the last option.
