Detailed description

Three diagrams. From left to right:

  1. Cartesian plane with origin O. Point A on the y-axis above O, and point B on the x-axis to the right of O. Line AB drawn.
  2. Cartesian plane with origin O. Point C on the y-axis above O. Line drawn through C parallel to the x-axis.
  3. Cartesian plane with origin O. Point D on the x-axis above O. Line drawn through D parallel to the y-axis.