1 / 6

Warm-Up

Warm-Up. Solve using the Elimination Method. x – y = 8. 5x + 7y = 4. (5,-3).

ezra
Download Presentation

Warm-Up

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warm-Up Solve using the Elimination Method. x – y = 8 5x + 7y = 4 (5,-3)

  2. CA Standards 9.0: Students solve a system of two linear equations in two variables algebraically and are able to interpret the answer graphically. Students are able to solve a system of two linear inequalities in two variables and to sketch the solution sets. Objective: (1) Students will solve word problems using systems of equations. Agenda: 12/05/11 1.) Warm-up 2.) Lesson: Word Problems – Items Purchased (ppt.) 3.) Class/Home Work Two (2) Assignments 4.) STAY ON TASK!!!!

  3. 8.4 Word Problems – Items Purchased Notes: Word Problems Type: Items Purchased Ex 1) John bought 3 CDs and 2 DVDs for $44. He Then bought 2 CDs and 4 DVDs for $56. How much did each DVD cost? LetC – Cost of CDs -2 3C + 2D = 44 -6C = -88 – 4D D – Cost of DVDs 2C + 4D 2C + 4D = 56 = 56 + 0 -4C = -32 -4 -4 C = $8 3C + 2D = 44 3(8)+ 2D = 44 24+ 2D = 44 -24 -24 2D = 20 D =$10 2 2

  4. 8.4 Word Problems – Items Purchased You Try: Ex 2) Liz bought 2 CDs and 2 DVDs for $54. She Then bought 4 CDs and 3 DVDs for $93. How much did each CD cost? LetC – Cost of CDs -2 2C + 2D = 54 -4C = -108 – 4D D – Cost of DVDs 4C + 3D 4C + 3D = 93 = 93 -D 0 = -15 -1 -1 D = $15 2C + 2D = 54 2C+ 2(15) = 54 2C+ 30 = 54 -30 -30 2C = 24 C =$12 2 2

  5. 8.4 Word Problems – Items Purchased Notes: Word Problems Type: Items Purchased Ex 3) James bought 5 tacos and 3 burritos for $22. For the same price he could have bought 3 tacos and 4 burritos. How much do burritos cost? LetT – Cost of Tacos = 22 -3 5T + 3B -15T = -66 – 9B B – Cost of Burritos = 22 5 3T + 4B 15T + 20B = 110 = 44 11B + 0 11 11 B = $4 3T + 4B = 22 3T+ 4(4) = 22 3T+ 16 = 22 -16 -16 3T = 6 T =$2 3 3

  6. 8.4 Word Problems – Items Purchased You Try: Ex 4) Greg bought 9 tacos and 2 burritos for $17. For the same price he could have bought 5 tacos and 3 burritos. How much do tacos cost? LetT – Cost of Tacos = 17 -3 9T + 2B -27T = -51 – 6B B – Cost of Burritos = 17 2 5T + 3B 10T + 6B = 34 = -17 + 0 -17T -17 -17 T = $1 5T + 3B = 17 5(1)+ 3B = 17 5+ 3B = 17 -5 -5 3B = 12 B =$4 3 3

More Related