1. Proportional and Non Proportional

2. Proportional  All direct variation equations are proportional.  This means that proportional functions must:  Go through the origin  Be linear

3. So look at the hand out… y-intercept is not 0not linear y-intercept is not 0

4. Yes; y = 4x No; y = 2x – 7 y-intercept is not 0 Yes; y = 3.5x No; y = -2x + 4 Yes; y = -5x

5.  Try writing an equation for the situation.  y = 30x + 25  y = 1.79x  y = 4x  y = 4x + 10  y = 7x √ √ √

6. Any LINE that goes through the origin Any LINEAR equation that has a y-intercept of 0 y = -3x y = x 2 + 5 y = 5x

7. y = 6x 12 18 30 6 01250125 y = 1.29x

8. You need to finish this in class.  You may work with your table partner if it does not get too loud.  Pull the last page off when complete.  WRITE YOUR NAME ON IT.  Turn it into the tray. It MUST be turned in BEFORE you leave.

9. When you finish Pete’s Plumbing:  You need to work on your homework assignment.  A#5 Proportionality HW Worksheet