Wednesday, November 28, 2007
Geometry (Class 31)
Overview
In today’s class we work to solidify our abilities for using algebra to solve geometric problems-- in particular the finding the point of intersection of two lines.
Textbook Sections
Vocabulary
Locus
Key Attitudes
Math is about reasoning and justifying.
Key Ideas
An equation for a line can be determined from the coordinates of two points.
In order to write the equation in slope-intercept form from two points, the slope of the line and the y-intercept needs to be determined.
In order to fins the point of intersection of two lines a system of two linear equations needs to be written and solved.
The key step in solving a system of equations is turning the two equations involving two variables into one equation with only one variable.
Two approaches for solving a system of two linear equations are 1) by using substitution, 2) by adding or subtracting the two equations.
Key Skills
Writing the equation of a line from two points.
Writing and solving a system of two linear equations.
Turn-In (#30)
§4.4 (Txt. p.223)#8-13, 19, 20
§4.5 (Txt. p.234) #17, 18
Chapter 4- Lesson 4.5
Handouts
Algebra and Geometry 5.5
Algebra and Geometry 6
Assignment
Algebra & Geometry 5.5 (Optional)
Algebra & Geometry 6
§4.6 (Txt. p.239) #8, 9, 11-13, 17, 18, 20, 21, 33, 34
Disclaimer- The assignment as stated in class is the official assignment. Every effort is made to keep this posting accurate, but you should refer to what was stated in class as the final word.
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