1. Assignment:
1­­>L6.2, pg. 345, #1­22 (all) ­ due Wednesday (1/9)
2­­>Test signed??
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2. Lesson 6.2 WarmUp:
Graph the following equations.
1) y = x ­ 3
2) y = ­x ­ 3
3) y = 2x + 4
4) y = ­3x + 2
5) y = ­1/2x + 2
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3. Lesson 6.2:
*Another method for solving a system of linear equations is called
substitution.
**Steps for using SUBSTITUTION:
­­solve one equation for one variable (isolate 1 variable)
­­substitute the new equation into the other equation for the
isolated variable; then solve the equation
­­then substitute the value from step 2 into either equation and
solve for the other variable
­­write the solution as an ordered pair
[check the solution in both equations!]
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4. Lesson 6.2 examples:
Use substitution to solve the system of equations.
A) y = 2x + 1
3x + y = ­9
B) x + 2y = 6
3x ­ 4y = 28
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5. C) y = 2x ­ 4
­6x + 3y = ­12
D) 2x ­ y = 8
y = 2x ­ 3
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6. E) y = 4x ­ 6
5x + 3y = ­1
F) 4x + 5y = 11
y ­ 3x = ­13
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7. G) The sum of 2 numbers is 180 and the difference between them is 24. Find the
2 numbers.
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