On the standard Cartesian graph, horizontal lines have zero slope. They all have the equation Y = a number
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Horizontal lines always have a slope of zero. (i.e completely flat, level surfaces have a slope of zero). However a line does not have to have a slope of zero in order to be a line.
No. the slope of parallel lines would be equal but not necessarily zero. How many values can m have in " y=mx +b "? where m is the slope of the lines.
a slope of zero. horizontal is undefined
All parallel lines have a zero slope.
For vertical lines, when you try to figure out the slope, you get zero in the denominator - in other words, a division by zero.