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Lesson 7-4

Lesson 7-4. Applications of Linear Systems WORD PROBLEMS…YEAH!. Algebra I Book Pg. 362.

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Lesson 7-4

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  1. Lesson 7-4 Applications of Linear Systems WORD PROBLEMS…YEAH!

  2. Algebra I Book Pg. 362 • Ex. 1 A metal worker has some ingots of metal alloy that are 20% copper and others that are 60% copper. How many kilograms of each type of ingot should the metal worker combine to create 80kg of a 52% copper alloy? • What throws you off in this problem?

  3. Algebra I Book Pg. 362 • Ex. 1 A metal worker has some ingots of metal alloy that are 20% copper and others that are 60% copper. How many kilograms of each type of ingot should the metal worker combine to create 80kg of a 52% copper alloy?

  4. Algebra I Book Pg. 363 • Ex. 2 Suppose a model airplane club publishes a newsletter. Expenses are $.90 for printing and mailing each copy, plus $600 total for research and writing. The price of the newsletter is $1.50 per copy. How many copies of the newsletter must the club sell to break even?

  5. Algebra I Book Pg. 365 • 1. Tyrel and Dalia bought some pens and pencils. Tyrel bought 4 pens and 5 pencils, which cost him $6.71. Dalia bought 5 pens and 3 pencils which cost her $7.12. Let a equal the price of a pen. Let b equal the price of a pencil. • Answer a, b, and c.

  6. 1. Tyrel and Dalia bought some pens and pencils. Tyrel bought 4 pens and 5 pencils, which cost him $6.71. Dalia bought 5 pens and 3 pencils which cost her $7.12. Let a equal the price of a pen. Let b equal the price of a pencil. • A. Equation for Tyrel. _____________________ • B. Equation for Dalia. _______________________ • C. Solve the system you wrote in A and B and find the price of the pen and pencil. • Pens are $1.19 • Pencils are $.39

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