The x-axis is normally defined as being perfectly horizontal, and thus has a slope of 0.
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the x-axis is the horizontal line which means the slope is 0. any line parallel also has a slope of zero
We know that the slope of a line is (Changes in y)/(Changes in x). Does the y-axes has changes in y? No. This means that y-axis does not have a slope. The same thing is for x-axis.
its the tangent of the angle the slope makes with the x-axis
0
For a reflection across the x axis, both the slope and the y intercept would have the same magnitude but the opposite sign.