1. Lesson 6­5.notebook
Assignment:
1­­>L6.5, pg. 365­366, #2­20 (evens) ­ Due Tomorrow (11/22)
2­­>Chapter 6 Test ­ Tuesday [12/3]
November 21, 2013

2. Lesson 6­5.notebook
Lesson 6.5 WarmUp:
Use elimination to solve the systems of equations.
1)
­4x + 5y = 17
4x + 6y = ­6
2)
6x ­ 2y = 1
10x ­ 2y = 5
3)
2x ­ y = 4
7x + 3y = 27
4)
2x + 7y = 1
x + 5y = 2
5)
9x ­ 2y = ­8
­7x + 3y = 12
November 21, 2013

3. Lesson 6­5.notebook
November 21, 2013
Lesson 6.5:
*We have now learned several ways to solve systems of equations:
­­graphing
­­substitution
­­elimination (using addition or subtraction)
­­elimination (using multiplication)
**Sometimes it is easier to "choose" which method to solve it...based on the
types of equations that you have been given.
***Substitution and elimination are the "algebraic" methods ­ and
graphing is good when you need an "estimate".

4. Lesson 6­5.notebook
Lesson 6.5 examples:
Determine the best method to solve the system of equations. Then solve it.
A) 5x + 7y = 2
­2x + 7y = 9
November 21, 2013

5. Lesson 6­5.notebook
B) y + 4x = 3
y = ­4x ­ 1
November 21, 2013

6. Lesson 6­5.notebook
C)
x ­ y = 9
7x + y = 7
November 21, 2013

7. Lesson 6­5.notebook
November 21, 2013
D) 3x ­ 4y = ­10
5x + 8y = ­2

8. Lesson 6­5.notebook
November 21, 2013
E) Jack has volunteered at SJ 50 hours and plans to volunteer 3 hours in
each coming week. Another volunteer, Claire, plans to volunteer 5 hours each
week. Write and solve a system of equations to find out when it will be when
they have volunteered the same number of hours.