7 7.3 (a.23) elimination (special cases and word problems
TRANSCRIPT
7 7.3 (A.23) Elimination (Special Cases and Word Problems).notebook
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January 10, 2014
Dec 85:22 PM
WarmUp
Solve the following system by elimination.
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Today's Agenda
* WarmUp
* Review Homework
* 7.3 Elimination Special Cases
* Scavenger Hunt
* 7.3 Elimination Word Problems
* Ticket Out the Door
* Homework
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Homework Review
1. (3 , 1)
2. (3 , 2)
3. (2 , 4)
4. (3 , 6)
5. (4 , 3)
6. (7 , 1)
7. (3 , 2)
8. (2 , 1)
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7.3 Elimination
Benchmark: A.23 Solve systems of equations using elimination.
Goals:
Solve systems of equations with special cases by using elimination.
Set up and solve real world problems using elimination.
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Special Cases
If all of the variables disappear and you are left with a TRUE statement (ie. 2 = 2), then there are infinitely many solutions.
If all of the variables disappear and you are left with a FALSE statement (ie. 1 = 2), then there is no solution.
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Example #1 REMINDER
Solve the following system by elimination.
7 7.3 (A.23) Elimination (Special Cases and Word Problems).notebook
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January 10, 2014
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Example #2 SPECIAL CASE
Solve the following system by elimination.
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Example #3 SPECIAL CASE
Solve the following system by elimination.
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Example #4
Solve the following system by elimination.
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Scavenger Hunt
Goal: Practice solving systems of linear equations using elimination.
You will be working in groups of 23. I will assign you a group and the station where you will start.
Copy the problem into one of the spaces on your worksheet.
Solve the system using elimination.Then find your answer at one of the other stations around the room.
Solve the next system and continue!
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Elimination and Word Problems
• Define your variables.• Let ___ be the number of ___.• Create two different equations from the
information in the problem.• Use elimination to solve the system.• Answer the question. (Don't forget labels!)• CHECK your answers.
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Word Problem #1
RV is selling tickets to the musical. On the first day of ticket sales, the school sold 10 senior citizen tickets and 6 student tickets for a total of $54. The school took in $19 on the second day by selling 5 senior citizen tickets and 1 student ticket. What is the price of each type of ticket?
7 7.3 (A.23) Elimination (Special Cases and Word Problems).notebook
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January 10, 2014
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Word Problem #2
Natalie and Jimmy are selling flower bulbs for a fundraiser. Customers can buy package of tulip bulbs and bags of daffodil bulbs. Natale sold 12 tulip packages and 3 daffodil bags for a total of $27. Jimmy sold 2 tulip packages and 12 bags of daffodils for a total of $16. What is the cost of one package of each type of flower bulbs?
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Word Problem #3
At a sale on summer clothing, Adam bought three pairs of shorts and four pairs of sunglasses for $110. Tom bought two pairs of shorts and three pairs of sunglasses for $80. What is the price of one pair of shorts? One pair of sunglasses?
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Word Problem #4
Anna bought three bags of chips and two bottles of soda from the grocery store for $3.50. Sarah bought two bags of chips and two bottles of soda from the same store and paid $3. How much is one bag of chips? One bottle of soda?
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Word Problem #5
Sam buys one book and two yoyo's for $6. Derek buys two books and one yoyo for $9. How much does each cost?
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Word Problem #6
Eight times a number plus five times another number is 13. The sum of the two numbers is 1. What are the numbers?
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Word Problem #7
Two times a number plus three times another number equals 4. Three times the first number plus four times the other number is 7. Find the numbers.
7 7.3 (A.23) Elimination (Special Cases and Word Problems).notebook
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January 10, 2014
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Classwork
7.3 Elimination Word Problems
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I You a Question
Topic Elimination Word Problems
Please solve the question on your Ticket Out the Door.
On the back of your paper Stoplight Self Assessment
Green I can do this!
Yellow I'm getting there!
Red I need help!
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Almost Finished
Take out your agenda copy down due dates
* Quizzes
* Tests
Homework
***7.3 Elimination Word Problems
Do NOT pack up until you are told to do so!