(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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