8th alg -l6.5

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

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

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".

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

Lesson 65.notebook

B) y + 4x = 3
y = 4x 1

November 21, 2013

Lesson 65.notebook

C)

x y = 9
7x + y = 7

November 21, 2013

Lesson 65.notebook

November 21, 2013

D) 3x 4y = 10
5x + 8y = 2

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.

8th alg -l6.5

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8th alg -l6.5