The slope is
(change in 'y' produced by a change in 'x') divided by (change in 'x' that produces it).
The slope of any horizontal line on the graph is zero because the value of 'y' is
the same everywhere on the line. No matter how much you change 'x' along
the line, 'y' never changes.
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It has no slope and is parallel to the x axis
The graph of [ y = 4x + 2 ] is a straight line with a slope of 4.Any line with a slope of 4 is parallel to that one, and any line parallel to that one has a slope of 4.
.... then your graph is inverted.
-2/3
When the slope of a line reaches zero it then will be parallel to the x or y axes depending if its a positive or a negative slope.