Monday, March 10, 2008
Algebra (Class 58)
Announcements
Test Friday focusing on work from Investigation 3 and Investigation 5. Rework the hard problems from the ACE and the warm-ups!
Lesson Title
Graphs of Linear Inequalities
Overview
In today’s class our warm-up continues to focus on using tables to organize information as a tool for writing equations. The lesson for today extends our work with linear inequalities focusing on being able to match a graph of a linear inequality with an equation.
Textbook Sections
§10-7 (Txt. p.490) Graphing Linear Inequalities
The Shapes of Algebra- Investigation 5.3 (p. 73)
Vocabulary
inequality
systems of linear inequalities
region
constraint
Key Attitudes
Math is about investigating and confirming
Key Ideas
Inequalities are used to represent situations where there is a limiting value.
Solutions to inequalities can be graphed on a number line when there is only one variable.
Solutions to inequalities are represented by a region on a two axis graph when two variables are involved.
When multiplying or dividing by a negative value, the direction of the inequality switches.
In equalities can include or not include the limiting value. We use a closed circle on the number line to represent including the limiting value and an open circle to represent not including the limiting value.
Key Skills
Find ordered pairs which satisfy two sets of constraints.
Graph a linear inequality on a coordinate plane.
Determine the region that satisfies a system of inequalities by trying points.
Match a linear inequality to its graph.
Turn-In (#57)
ACE p.78 #1, 3, 14
ACE p.42 #34, 35, 39, 45
Handouts
No Handouts Posted
Assignment
ACE p.78 #2, 4, 5
ACE p.42 #40, 46
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.
Permalink