# Parallel and Perpendicular Lines?

• Nov 1st 2007, 02:44 AM
sgw89
Parallel and Perpendicular Lines?
To find parallel and perpendicular lines:

01) The slope of a line is 3/2. What is the slope of any line parallel to this line?

02) The slope of a line is -4/5. What is the slope of any line perpendicular to this line?

help?
• Nov 1st 2007, 03:22 AM
Krizalid
Two lines are parallel if their slopes are equal, $m_1=m_2.$

Two lines are perpendicular if their product is $-1,$ this is $m_1\cdot m_2=-1.$
• Nov 1st 2007, 10:23 AM
ThePerfectHacker
Quote:

Originally Posted by Krizalid
Two lines are perpendicular if their product is $-1,$ this is $m_1\cdot m_2=-1.$

Two non-vertical lines are perpendicular if ....

I am just saying that because you love dead accuracy.:D