The horizontal (X) and vertical (Y) axes or lines are labelled to tell you what data has been collected and when. The horizontal axis is a line which goes straight across from left to right.

It has the coordinates (0, 0). The 𝒙-axis is the horizontal line and the 𝒚-axis is the vertical line. The origin is the position where 𝒙 = 0 and 𝒚 = 0. The origin has coordinates (0 ...