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Corresponding Angles Postulate
a. If 2 corresponding angles have the same measure, then the lines are parallel
b. If 2 lines are parallel, then the corresponding angles have the same measure
Parallel Lines and Slopes Theorem
2 non-vertical lines are parallel if and only if they have the same slope
Perpendicular Lines and Slopes Theorem
2 non-vertical lines are perpendicular if and only if the product of their slopes is -1
Multiplication Property of Inequality
if a < b, then a x c < b x c (if c > 0)
if a < b, then a x c > b x c (if c < 0)
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