Izzy and Amie made the zero with a line through it!
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How about "is always zero"?
A straight line passes through the x-axis one time, if its slope is non-zero, or not at all, if its slope is zero.
The slope is zero.
A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.
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.