11/16/11 Honors Algebra

Lots of students were attending e-Conference today with DECA.

After discussing questions from practice sheets 81 & 82 – Writing equations of lines given one-point & slope / given 2-points;  Specifically page 82  #8 and 11…

#8   (4, 8) (4, -2) When we graph these points – we have a vertical line; when we calculate slope, we have undefined slope – so how do we write an equation to represent this line?  What do you notice about the points?  The x’s are both 4.  Eq: x = 4

#11 (0, 2) (-4, 2)  When we graph these points – we have a horizontal line, when we calculate the slope, we have zero slope – so how do we write an equation to represent this line?  y = 0x + 2…OR we could simply look at the points, notice the y’s are both 2.  Eq.  y = 2

During class, we looked at writing equations for parallel & perpendicular lines.  See links for examples.

3 practice problems:

 

 

 

 

Also – HW!  Retake your Linear Pre-Test!

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