Slopes

1
Slopes

• Attribute of linesnumerical measure of parallel
  and perpendicular

2
The number slope
m
m
3
Parallel Perpendicular

• Postulate Two nonvertical lines are
  parallel if and only if they have the
  same slope.
• Postulate Two nonvertical lines are
  perpendicular if and only if the product
  of their slopes is -1.
• Note if and only if means the converse is also
  true!

4
Homework

• P. 142143 17-31, 32-42 even
• Prepare for a quiz on sections 1, 2, 3 (note the
  self-test on p. 145)
• Sources of help found at
• http//seaford.k12.de.us/es/shalter