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Nkosi · Answer 1 · 2017-04-29T05:27:53+0000

The slope of every horizontal line is zero. The slope is calculated by (y2 - y1) / (x2 - x1). For every point on a horizontal line, its y-coordinates are the same. e.g. (2,8), (4,8), (6,8) etc. Hence (y2 - y1) = 0 always. The answer is (a) 0

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