David W. answered 11/19/15
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A Horizontal Line has the same value of y (it is constant) for every possible value of x.
The Point (-6,4) is on the line. So are the points (10,4) and (2,4) and the y-intercept at (0,4). That's why we can write the equation of the line as y=4. It has points (n,4) for any allowable value of n.