9/20 Fri: Reflections across the Y axis

HW: page 121 (#s 1 and 4), page 122 (#s 4, 5, 7, and 10)

AGENDA:
DIN: Read page 120
1. Review HW page 63
**PM GROUP-need to do graphing activity from yesterday first**
2. Watch Intro to Reflections Video (stop after reflecting across the y and x axis)
VOCAB: line of reflection, prime notation, reflection across the x and y axis, congruent, image
3. EXPLORE! Using graph paper, draw the coordinate plane-notice the arrow heads on the end of both x and y axes.  They indicate that the number line continues in both directions indefinitely.

• label the axis
• label the integers on both number lines (the axes) up until 7 on each end (positive and negative)
• graph the following point A (2,3).  Write the coordinates on the graph.  Connect them in order with darkened lines.
• Highlight the Y axis.  Fold the paper exactly on the line of the Y axis.  
• heavily shade over the back of the paper where the point is.
• open the paper up. What happened? 
• Which quadrant is the "reflection point" in?  
• Write the new coordinates under that image point and label each of the image points with prime notation
  

4. Review the REFLECTION NOTE PAGE at the back of the workbook.  Highlight Y AXIS.  Identify the rule for reflecting points in the y axis.
5. Begin working on HW