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Algebra 9/27/19

Algebra 9/27/19. AGENDA *Solving Systems by Substitution Notes *Group Round Robbin *IXL Practice. Bellringer on GOFORMATIVE!. OBJECTIVE: I can solve a system of linear equations algebraically by substitution. How much is enough?.

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Algebra 9/27/19

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  1. Algebra 9/27/19 AGENDA *Solving Systems by Substitution Notes *Group Round Robbin *IXL Practice Bellringer on GOFORMATIVE! OBJECTIVE: I can solve a system of linear equations algebraically by substitution.

  2. How much is enough? HW Wk 8 due 9/27/19 is desmos marble SlidesCode: 3p74awEOS due 10/2/19Also, you need to be working on your EOS for final exam which is in 1 week. This EOS can be khan academy, ixls, or from the online textbook. You need to have activities that are self-checking,to ensure you are doing the problems correctly. For the EOS note the date, time spent, and activity, and grade in a chart like the one below.

  3. When graphing can no longer cut it! What is this solution?

  4. When graphing can no longer cut it! What is this solution?

  5. 2x + 3y = 31 y=x+7

  6. 2x + 3y = 31 y=x+7

  7. 2c-d= -2 4c+d=20

  8. Substitution 2x + 3y = 31 y=x+7 (x+7) 2x + 3 = 31 Post-It Note (x+7)

  9. Substitution 2x + 3y = 31 y=x+7 (x+7) 2x + 3 = 31 Post-It Note (x+7)

  10. 2x + 3 = 31 (x+7)

  11. 2x + 3 = 31 2x + 3x+21 = 31 (x+7) 5x+21 = 31 5x = 10 x = 2

  12. Substitution #2 2c-d= -2 4c+d=20 Which variable would be easiest to solve for? Post-It Note

  13. Substitution #2 2c-d= -2 4c+d=20 Which variable would be easiest to solve for? Post-It Note

  14. 2c-d= -2 #2 4c+d=20 2c- = -2 d=-4c+20 (-4c+20) (-4c+20) 2c +4c-20 = -2 6c-20 = -2 d=-4(3)+20 d=-12+20 d=8 6c = 18 c = 3

  15. #2 Solution Check (3,8) 4c+d=20 2c-d= -2 4(3)+(8)=20 12+8=20 20=20 True 2(3) –(8)= -2 6–8= -2 -2= -2 True

  16. Brain Break & Handwriting Break http://www.mathplayground.com/wangdoodles.html

  17. Round Robbin A. C. Check Sum D. B.

  18. Round Robbin A. C. Check Sum D. B.

  19. IXL Tic-Tac-Toe You vs. shoulder partner Get to claim a spot when reach 20% 40% 60% 80% Then move to next section.

  20. IXL Tic-Tac-Toe

  21. Solo Time Solve by substitution- You may use the back to show your work & write final solution under the system. Show all work & check. No calculator.

  22. Exit Ticket

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