Answer:
Slope of a line is defined as the tangent of the angle (called angle of inclination) the line makes with the x-axis in the anti-clockwise or counter-clockwise direction. Since the line considered is x-axis itself, the angle of inclination is 0 degrees and since tan 0 degrees = 0, slope of x-axis is 0.
Step-by-step explanation: ( happy to help) ;)
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