1 / 29

11.26.18

11.26.18. No Bell ringer today: Get ready to Take notes. Learning Target. I can solve a system of equations algebraically b y substitution. AGENDA. ~Systems by Substitution Notes ~Practice  ~IXL. Sometimes, graphing is not the best method to solve a system. What’s the sol?.

fai
Télécharger la présentation

11.26.18

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. 11.26.18 No Bell ringer today: Get ready to Take notes. Learning Target I can solve a system of equations algebraically by substitution.

  2. AGENDA ~Systems by Substitution Notes ~Practice  ~IXL

  3. Sometimes, graphing is not the best method to solve a system. What’s the sol?

  4. Sometimes, graphing is not the best method to solve a system. What’s the sol?

  5. When we need a precise measurement, or the graph isn’t a whole number, we can use the SUBSTITUTION method to solve systems.

  6. Solving Systems of Equations by SUBSTITUTION Think “Substitute teacher” or subbing in a second string player for a hurt starter. One takes the place of the other.

  7. Ex 1 When you Know x or y Value-halfway there!

  8. Ex 1 When you Know x or y Value-halfway there!

  9. Ex 2 y = -2 4x – 3y = 18

  10. Ex 2 y = -2 4x – 3y = 18

  11. What if the SUB is not just a number?

  12. Ex3- When you Don’t know y’s value, But you CAN substitute 2x

  13. Ex3- When you Don’t know y’s value, But you CAN substitute 2x

  14. Practice: #1-4 Show all work on your paper. X=? One term for y

  15. SUBSTITUTION Let’s say we have two equations, both equal to 5.

  16. SUBSTITUTION Is it true that 7-2 is the same as 1(5)? We will be working from this simple example.

  17. Solving Systems of Equations by SUBSTITUTION Since y equals “x-3” and y also Equals “2x” we can say x-3=2x, just like we did with 7-2=5(1)

  18. Solving Systems of Equations by SUBSTITUTION Now solve for “x”

  19. Solving Systems of Equations by SUBSTITUTION -x -x -3 = x Now solve for “x”

  20. Solving Systems of Equations by SUBSTITUTION Since we know x, substitute into one of the equations to find “y” -x -x -3 = x

  21. Solving Systems of Equations by SUBSTITUTION -x -x -3 = x Solution (-3,-6) y = -6

  22. CHECKING: Solution (-3,-6) -6 true true

  23. Solution (-3,-6) -6 true true We just used SUBSTITUTION to solve the system. This example is also the TRANSITIVE PROPERTY.

  24. Ex 4

  25. Ex 4

  26. Practice 2. 1. 2

  27. Reflection on Padlet Post a picture of a real-world situation that requires a substitute be unique-if it is already posted, or given in class, it isn't an option. Then, IXL AA.8 to an 85% https://padlet.com/poolec/subs2nd

  28. GEOME-TREE!  Review for Semester Test. Choose from the following categories: EQUATIONS SLOPE-INTERCEPT PYTHAGOREAN THEOREM RATIONAL/IRRATIONAL

More Related