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What is the slope of a line that is parallel to the x-axis

What is the slope of the line that passes through the points (-3, 5) and (1, 7)?

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The slope of a line parallel to the x axis is 0 because
slope = rise / run
and since it's parallel to the x axis (horizontal), the rise is 0.

The slope of a line through (-3, 5) and (1, 7) is
= (7 - 5) / (1 - (-3) )
= 2 / 4
= 1 / 2
User Jan Jongboom
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