Monday, April 23, 2007
Algebra (Class 71)
Announcements
Quiz Friday focusing on writing equations for linear patterns and finding the point of intersection of two lines using graphing and algebra.
Overview
In the last class we saw that we could find the point of intersection using three different methods: 1) by graphing, 2) by using substitution, 3) by adding or subtracting the two equations. In this class we practice all three methods as well as extend the third method so that it works in more cases. The key will be putting multiplication to work for us.
Textbook Sections
§9-5 (Txt. p.430) Multiplication with the Addition-or-Subtraction Method
Key Attitudes
Mathematics is about generalizing and applying patterns.
Key Ideas
The solution to a system of equations is represented graphically by the point of intersection of two lines.
The coordinates of the point of intersection of two lines will be a shared solution to both equations.
Two equations will have a shared solution ONLY IF the two lines intersect.
The law of balance helps us solve systems of equations by allowing us to add equal expressions to both sides of an equation thereby eliminating a variable.
Key Skills
Finding the point of intersection of two lines by: graphing, using substitution, using addition or subtraction of equations.
Finding regions of intersection using graphing
Key Skills
Finding the point of intersection of two lines by: graphing, using substitution, using addition or subtraction of equations.
Finding regions of intersection using graphing
Turn In
Class 70 Notes
WS 13.13 and 13.14
Handouts
No Handouts Posted
Assignment
§9-5 (Txt. p.432) #10-15
§9-4 (Txt. p.427) #1-6, 19-21, 28
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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