Warm Up Algebra 1 Book Pg 352 # 1, 4, 7, 10, 12.

Slides:



Advertisements
Similar presentations
1.7 Solving Absolute Value Inequalities
Advertisements

Do Now: Solve, graph, and write your answer in interval notation.
College Algebra: Section 1
Name: Date: Period: Topic: Solving Absolute Value Equations & Inequalities Essential Question: What is the process needed to solve absolute value equations.
Solving Inequalities To solve an inequality, use the same procedure as solving an equation with one exception. When multiplying or dividing by a negative.
Solve an absolute value inequality
Recall that the absolute value of a number x, written |x|, is the distance from x to zero on the number line. Because absolute value represents distance.
Solving Inequalities Objective: The student will be able to solve inequalities. Algebra 2.
Solving Inequalities To solve an inequality, use the same procedure as solving an equation with one exception. When multiplying or dividing by a negative.
Copyright © 2014, 2010, 2007 Pearson Education, Inc.
1.8 Solving Absolute Value Equations and Inequalities
How do I solve absolute value equations and inequalities?
Absolute Value Equalities and Inequalities Absolute value: The distance from zero on the number line. Example: The absolute value of 7, written as |7|,
Absolute Value Inequalities. Language Goal  Students will be able to read and say inequalities that involve absolute values. Math Goal  Students will.
Aim: How do we solve Compound Inequalities? Do Now: Solve the following inequalities 1. 2x + 3 > x < 10 How do we put two inequalities together?
Section 5 Absolute Value Equations and Inequalities
1.7 Solving Compound Inequalities. Steps to Solve a Compound Inequality: ● Example: ● This is a conjunction because the two inequality statements are.
Warm Up Solve. 1. y + 7 < – m ≥ – – 2x ≤ 17 y < –18 m ≥ –3 x ≥ –6 Use interval notation to indicate the graphed numbers (-2, 3] (-
Section 7.2 Solving Absolute Value Equations. Def. Absolute value represents the distance a number is from 0. Thus, it is always positive. Absolute value.
Chapter P Prerequisites: Fundamental Concepts of Algebra 1 Copyright © 2014, 2010, 2007 Pearson Education, Inc. 1 P.9 Linear Inequalities and Absolute.
Chapter 2.7 – Absolute Value Inequalities. Objectives Solve absolute value inequalities of the form /x/ < a Solve absolute value inequalities of the form.
Chapter 2: Equations and Inequalities
1.8 Solving Absolute Value Equations and Inequalities Objectives: Write, solve, and graph absolute value equations and inequalities in mathematical and.
Solving Absolute Value Inequalities. Solving Absolute Value Inequalities 1. ax+b 0 Becomes an “and” problem Changes to: –c < ax+b < c 2. ax+b > c, where.
5.5 Solving Absolute Value Inequalities
Copyright © Cengage Learning. All rights reserved. Fundamentals.
Write out the compound inequalities. 1.x is at most -2 or at least 0 2.y is less than 9 and greater than or equal to 1 Solve the inequalities
SOLVE ABSOLUTE VALUE INEQUALITIES January 21, 2014 Pages
Section 4.3 Solving Absolute Value Equations and Inequalities
CHAPTER 1 – EQUATIONS AND INEQUALITIES 1.6 – SOLVING COMPOUND AND ABSOLUTE VALUE INEQUALITIES Unit 1 – First-Degree Equations and Inequalities.
EXAMPLE 1 Solve a simple absolute value equation Solve |x – 5| = 7. Graph the solution. SOLUTION | x – 5 | = 7 x – 5 = – 7 or x – 5 = 7 x = 5 – 7 or x.
1.8 Solving Absolute Value Equations and Inequalities Objectives: Write, solve, and graph absolute value equations and inequalities in mathematical and.
Holt Algebra Solving Absolute-Value Equations and Inequalities Solve compound inequalities. Write and solve absolute-value equations and inequalities.
Warm Up Solve each inequality. 1. x + 3 ≤ x ≤ 7 23 < –2x + 3
Do Now 1. Solve 2x+3>x+5 2. Solve - c - 11>23 3. Solve 3(-r-2) 2 C < - 34.
4.4 Absolute Value 11/14/12. Absolute Value: The distance of a number from 0 on a number line. Written as l x l Ex. |5| (distance of 5 from 0) = 5 Ex.
3-6 Solving Equations Involving Absolute Value (1 st ½ of Lesson) 3-6 Solving Equations Involving Absolute Value (1st ½ of Lesson) Objectives: To solve.
Warm up. Absolute Value Function 7.5 This is a new function, with its own equation and graph.
Solving Absolute Value Equations Absolute value is denoted by the bars |3|. Absolute value represents the distance a number is from 0. Thus, it is always.
Section 2.6 Solving Linear Inequalities and Absolute Value Inequalities.
Algebra 2 Lesson 1-6 Part 2 Absolute Value Inequalities.
1.7 Solving Absolute Value Inequalities. Review of the Steps to Solve a Compound Inequality: ● Example: ● You must solve each part of the inequality.
Solving Absolute Value Inequalities. Review of the Steps to Solve a Compound Inequality: ● Example: ● This is a conjunction because the two inequality.
Section 2.7 – Linear Inequalities and Absolute Value Inequalities
– 8 and 8 is a solution of the
> greater than or equal
Aim: How do we solve absolute value inequalities?
Solving Absolute Value Equations
Absolute Value Equations & Inequalities
1.7 Solving Absolute Value Inequalities
Compound Inequalities - AND
Compound Inequalities
1.8 Solving Absolute Value Equations and Inequalities
Aim: How do we solve absolute value equations?
Solving Absolute Value Equations
1.7 Solving Absolute Value Inequalities
Absolute Value Inequalities
OBJECTIVE: Students will solve absolute value inequalities.
Aim: How do we solve Compound Inequalities?
Absolute Value Inequalities
Solve Absolute Value Equations
1.6 Solving Linear Inequalities
Absolute Value Inequalities
Do Now: Solve, graph, and write your answer in interval notation.
Solving Absolute Value Inequalities
1.7 Solving Absolute Value Inequalities
L1-5 Algebra 2.
1.7 Solving Absolute Value Inequalities
Solving Absolute Value Equations
Presentation transcript:

Warm Up Algebra 1 Book Pg 352 # 1, 4, 7, 10, 12

Warm Up Answers Algebra 1 Book Pg 352 # 1, 4, 7, 10, 12 1. x < 5 10. x > -9 or x < -12 12. x < -1 or x > 29/5

Solving Linear Inequalities Algebra 1 Textbook section 6.4 Algebra 2 Textbook section 1.7 The student will be able to: Solve and graph absolute value equations Solve and graph absolute value inequalities

Solving Absolute Value Equations Absolute value is denoted by bars on each side of a number or expression |3|. Absolute value represents the distance a number is from 0. Thus, it is always positive. |8| = 8 and |-8| = 8

Solving absolute value equations First, isolate the absolute value expression. Set up two equations to solve. Same and Opposite For the first equation, write it the Same way you see it without the absolute value bars and solve. For the second equation, write it the Opposite way without the absolute value bars and solve Only write the opposite of the RIGHT SIDE of the equal sign. Always check the solutions.

6|5x + 2| = 312 6|5x + 2| = 312 |5x + 2| = 52 Same Opposite Isolate the absolute value expression by dividing by 6. 6|5x + 2| = 312 |5x + 2| = 52 Same Opposite 5x + 2 = 52 5x + 2 = -52 5x = 50 5x = -54 x = 10 or x = -10.8 Check: 6|5x + 2| = 312 6|5x + 2| = 312 6|5(10)+2| = 312 6|5(-10.8)+ 2| = 312 6|52| = 312 6|-52| = 312 312 = 312 312 = 312

3|x + 2| -7 = 14 x + 2 = 7 x + 2 = -7 x = 5 or x = -9 Isolate the absolute value expression by adding 7 and dividing by 3. 3|x + 2| -7 = 14 3|x + 2| = 21 |x + 2| = 7 Same Opposite x + 2 = 7 x + 2 = -7 x = 5 or x = -9 Check: 3|x + 2| - 7 = 14 3|x + 2| -7 = 14 3|5 + 2| - 7 = 14 3|-9+ 2| -7 = 14 3|7| - 7 = 14 3|-7| -7 = 14 21 - 7 = 14 21 - 7 = 14 14 = 14 14 = 14

Review of the Steps to Solve a Compound Inequality: Example: You must solve each part of the inequality. The graph of the solution of the “and” statement is the intersection of the two inequalities. Both conditions of the inequalities must be met. In other words, the solution is wherever the two inequalities overlap. If the solution does not overlap, there is no solution.

Review of the Steps to Solve a Compound Inequality: Example: You must solve each part of the inequality. The graph of the solution of the “or” statement is the union of the two inequalities. Only one condition of the inequality must be met. In other words, the solution will include each of the graphed lines. The graphs can go in opposite directions or towards each other, thus overlapping. If the inequalities do overlap, the solution is all real numbers.

Solving an Absolute Value Inequality Step 1: Rewrite the inequality as an AND or an OR statement : If you have a you are working with an ‘and’ statement. Remember: “Less thand” If you have a you are working with an ‘or’ statement. Remember: “Greator” Step 2: In the second equation you must negate the right hand side and reverse the direction of the inequality sign. Set up a SAME inequality and an OPPOSITE inequality Solve as a compound inequality.

Example 1: |2x + 1| > 7 2x + 1 > 7 or 2x + 1 >7 This is an ‘or’ statement. (Greator). Rewrite. In the 2nd inequality, reverse the inequality sign and negate the right side value. Solve each inequality. Graph the solution. |2x + 1| > 7 2x + 1 > 7 or 2x + 1 >7 2x + 1 >7 or 2x + 1 <-7 x > 3 or x < -4 3 -4

Example 2: This is an ‘and’ statement. (Less thand). |x -5|< 3 Rewrite. In the 2nd inequality, reverse the inequality sign and negate the right side value. Solve each inequality. Graph the solution. |x -5|< 3 x -5< 3 and x -5< 3 x -5< 3 and x -5> -3 x < 8 and x > 2 2 < x < 8 8 2

Charts to Help Copy the chart from the following page in your notes! Algebra 1 Pg 354 Algebra 2 Pg 53