1. Bell Ringer: Simplify:
Monday, April 26th
Bell Ringer:
Simplify:
Homework: pg 379 # 11, 12, 15, 16

2. Bell Ringer Answer
Homework: pg 379 # 11, 12, 15, 16

3. Guess What? You just did the hardest part of today…
Today we are going to be doing high level math
This is getting you ready for geometry, Algebra II and college…

4. Systems of Equations Remember a system of equations are:
a set of two or more equations with two or more variables
In order to solve a system of equations with two variables we need:
2 EQUATIONS!!
Homework: pg 379 # 11, 12, 15, 16

5. Last week We learned how to solve a system using Graphing Tables
Homework: pg 379 # 11, 12, 15, 16

6. This Week
Monday + Tuesday: I CAN solve a system of equations using Substitution
Friday: I CAN review substitution and dominate a substitution quiz
Homework: pg 379 # 11, 12, 15, 16

7. Example #1
Solve using substitution:

8. Step 1: Substitute for y
Step 2: solve for x

9. Step 3 substitute for x
Step 4: Find the value of Y
So our solution is:

10. We always check our solution

11. Suppose a rectangle swamp has a perimeter of 124 feet
Suppose a rectangle swamp has a perimeter of 124 feet. The length of the swamp is 10 feet less than 5 times its width. What are the length and width of the swamp?

12. Step 1: Substitute for L
Step 2: Solve for w

13. Step 3 substitute for w
Step 4: Find the value of Y
So our solution is:

14. Now Check…

15. Summary
The SUBSTITUTION method is best when one of the variables is already solved for

16. Rest of class…Complete the back of the worksheet