Trifid cipher And systems of equations

1. Trifid cipher Andsystems of equations

2. For this lesson you will… • Complete a Worksheet • Make 2 graphic organizers • Turn to the next page in your notebook • Title that page: • Two ways to solve a system of equations • ELIMINATION • SUBSTITUTION • Title the next page: • How to encode a message using the TRIFID cipher

3. System of Equations… • Combine equations to eliminate a variable. • Solve for remaining variable. • Replace in an original equation to solve for ‘eliminated’ variable.

4. System of Equations… • Solve one equation for one variable. • SUBSTITUE this solved equation into the other equation. • Place this found value into the unsolved equation to solve for ‘eliminated’ variable.

6. 1. (-1,1)

7. 1. (-1,1)

8. Completed Grid

9. The Solution… _____ _____ _____ _____ _____ _____

10. The Solution… (3,2,1) (2,3,3) (1,3,3) (1,3,2) (1,3,3) (1,1,2) T R I F I D

11. What if I get stuck? • Recall our chart on the wall… • AND TRY… • Look back at easier problems on the worksheet • Consider both SUBSTITUTION and ELIMINATION • WHICH IS EASIER FOR THIS PROBLEM? • Where is our CHAMP for today? • Look in your book for more hints • If none of these work, bring me evidence you tried them all and … • Ask me for help…