Wednesday, February 27, 2008
Algebra (Class 54)
Announcements
Test next class focusing on solving systems of equations by substitution or combination, changing equations from slope-intercept into standard form and back, finding slopes and intercepts,
Lesson Title
Intersections of Lines
Overview
In today’s class we continue our work with solving systems of linear equations. We develop equations from a situation involving membership to a school club and see how solving a system of equations can be used to answer key questions about this situation.
Textbook Sections
Structure and Method §9-4 ( p.426) The Addition-or-Subtraction Method
The Shapes of Algebra- Investigation 3.3 (p. 41)
Vocabulary
systems of equations
eliminate variable
isolate
solution to an equation
Key Attitudes
Math is about investigating and confirming
Key Ideas
An equation with two variables has many solutions.
In order for a number(s) to be a solution(s) to an equation, the numbers must make the equation true when substituted into the equation.
Equations can be written in different forms.
Two equations can be equivalent but be in different forms.
In order for a point to be the solution of a system of equations, the point must be located at the intersection of the graphs.
Lines only intersect once, all the time, or not at all.
Key Skills
Creating an equation with two variables to represent a situation.
Graphing equations in standard form or slope intercept form.
Estimate the location of the point of intersection of two lines from a graph.
Turn-In (#53)
§9-2 (Txt. p.419)#5
§9-3 (Txt. p. 427) #5
ACE p.42 #1, 7, 21, 22
Handouts or Links
Investigation 3 Crossword
Assignment
§9-2 (Txt. p.419)#6
§9-3 (Txt. p. 427) #6
ACE p.42 #2, 4, 42, 43
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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