By Ron Larson and Bruce Edwards

Calculus 10e Easy Access Study Guide
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  Array ( [10] => Array ( [convert_chars] => Array ( [function] => convert_chars [accepted_args] => 1 ) [trim] => Array ( [function] => trim [accepted_args] => 1 ) ) [11] => Array ( [capital_P_dangit] => Array ( [function] => capital_P_dangit [accepted_args] => 1 ) ) )

Find equations of parallel and perpendicular lines