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Answer :

Answer: slope = 0

Explanation:

Any horizontal line always has a slope of 0. The slope is rise/run. Horizontal lines don't have a rise or fall, so rise = 0. The run can be any nonzero value you want.

You can also use the slope formula

m = (y2-y1)/(x2-x1)

and you can pick any two points from that blue line.