A1-U1.7 Lesson: Absolute Value Equations
Presentation
•
Mathematics
•
9th - 12th Grade
•
Practice Problem
•
Medium
Standards-aligned
Kyle Evans
Used 157+ times
FREE Resource
5 Slides • 5 Questions
1
Open Ended
ACT Prep Warm-Up:
Error Analysis: Jess solves the following: 13<5n−2 or 3n+1>4n +4
Here are her steps:
1) Add two to both sides of the first inequality, then divide both sides by five.
2) Subtract 3n and 4 from both sides, then divide by negative one.
3) Graph: Open at n>3, and open at n<-3, shading toward the infinities.
Is she correct? If not explain what should have been done.
2
Unit 1 Lesson 7a Absolute Value Equations
3
Distance from zero. Always expressed as a whole number.
Absolute Value
Concepts:
4
Multiple Choice
Evaluate: ∣7∣
7
-7
0
49
5
Multiple Choice
Evaluate: ∣−12∣
12
-12
144
0
6
Procedure:
1) Isolate the absolute value.
2) Drop the absolute value bars.
3) Write two equations with opposite outputs.
4) Use inverse operations to solve.
5) Express your answers.
7
Reorder
Reorder the following steps used to solve absolute value equations.
Isolate the absolute value.
Drop the absolute value bars.
Write two equations with opposite outputs.
Use inverse operations to solve.
Express your answers.
8
Example 1:
9
Example 2:
10
Multiple Choice
Solve: ∣−5−2x∣−9=4
-9, 4
9, -4
-9, -4
9, 4
ACT Prep Warm-Up:
Error Analysis: Jess solves the following: 13<5n−2 or 3n+1>4n +4
Here are her steps:
1) Add two to both sides of the first inequality, then divide both sides by five.
2) Subtract 3n and 4 from both sides, then divide by negative one.
3) Graph: Open at n>3, and open at n<-3, shading toward the infinities.
Is she correct? If not explain what should have been done.
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