No reason, it's just a useful habit. We could call it banana if we wanted.
Chat with our AI personalities
The graph of [ y = 7 ] is a straight horizontal line, passing through the point [ y = 7 ]on the y-axis. The slope of a horizontal line is zero.
6
The line y = 6 is horizontal and has a slope of zero, as does any line that is parallel to it.
Zero. Y=4 is a horizontal line.
vertical