1. Assignment:
1­­>L6.5, pg. 365­366, #1­20 (all) ­ Due Wednesday (1/25)
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2. 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
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3. 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".
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4. Lesson 6.5 examples:
Determine the best method to solve the system of equations. Then solve it.
A) 5x + 7y = 2
­2x + 7y = 9
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5. B) y + 4x = 3
y = ­4x ­ 1
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6. C) x ­ y = 9
7x + y = 7
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7. D) 3x ­ 4y = ­10
5x + 8y = ­2
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8. 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.
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