(2, -5) and (-1, -1)
*Simplify
The slope of the line is -4/3.
Since the slope is negative, the line would fall (left to right).
(7, 1) and (7, 2)
*Simplify
Since the slope is undefined, the line is vertical.
(1, 7) and (-2, -2)
*Simplify
The slope of the line is 3.
Since the slope is positive, the line would rise (left to right).
(-1, -5) and (-4, -5)
*Simplify
The slope of the line is 0.
Since the slope is zero, the line is horizontal.
Last revised on Jan. 16, 2010 by Kim Seward.
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