1. Assignment:
1­­>L6.3 ­­>pg. 351­352, #1­22 all ­ Due Thursday (1/19)
2­­>Checkpoint 6.1­6.2 ­ Due Thursday (1/19)
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2. Lesson 6.3 WarmUp:
Solve #1­2 by graphing.
1) y = 1/2x
x + y = 3
2) y = 2x + 3
3y = 6x ­ 6
Solve #3­5 by substitution.
3) x + 2y = 13
3x ­ 5y = 6
4) y = 4x ­ 1 5) x ­ 5y = 10
y = 2x ­ 5 2x ­ 10y = 20
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3. Lesson 6.3:
*ANOTHER way to solve a linear system is by using ELIMINATON.
*Steps:
­write the system so that "like" terms are aligned
­add or subtract the equations, eliminating one variable. Then
solve for the remaining variable
­substitute the value from step 2 into one of the equations and
solve for the other variable
­write the solution as an ordered pair
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4. Lesson 6.3 examples:
Use elimination to solve each system of equations.
A) 4x + 6y = 32
3x ­ 6y = 3
B) 4y + 3x = 22
3x ­ 4y = 14
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5. **Sometimes we can eliminate one variable by "subtracting" one equation
from the other one...
C) 8b + 3c = 11
8b + 7c = 7
D) 2t + 5r = 6
9r + 2t = 22
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6. E) ­3 times a number plus 5 times another number is ­11. 3 times the
first number plus 7 times the other number is ­1. Find each number.
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