Collinearity and Writing New Equations for Parallel or Perpendicular Lines

Students learned about collinearity today. Points that are collinear have the same slope. In addition, we learned how to find equations for lines that are parallel or perpendicular to a given line. The steps include:
•determine the slope of the new line (m or the negative reciprocal of m)
•write a new equation in slope-intercept form using the new slope
•use a point on the original line to replace the x and y values in the new equation so you can solve for b
•put the new b value in the new equation

Note: Because so many students will be missing class tomorrow (to present or listen to personal narratives), concept 7 test will now be given on Tuesday, January 17th (not tomorrow, as previously announced).

Tonight's Homework: CME, page 316 (1), 330 (1) and 341 (3)