3/16/16 warm up€¦ · solving systems by substitution part 2 7 march 16, 2016 mar 109:46 am using...
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Solving Systems by Substitution Part 2
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3/16/16 Warm UpWhich ordered pair is the solution of the system?
10 8 6 4 2 0 2 4 6 8 10
1098765432
12345678910
x
y
a. (2, 7) b. (4, 2)
c. (2, 1) d.
Solving Systems by Substitution Part 2
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Unit 6: Systems of Equations and Inequalities
Solving Systems by SubstitutionObjective: To solve systems using substitution
Substitution Method: a method for solving a system of equations by replacing one variable with an equivalent expression containing the other variable.
Solving Systems by Substitution Part 2
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Using Substitution (pg. 372)
Example: What is the solution of the system? Use substitution. Check your answer.
y = 3x
x + y = ‐32
Solving Systems by Substitution Part 2
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Practice: What is the solution of the system? Use substitution. Check your answer.
y = 2x + 7
y = x ‐ 1
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3y + 4x = 14
‐2x + y = ‐3
Solving for a Variable and Using Substitution (pg. 373)
Example: What is the solution of the system? Use substitution. Check your answer.
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Practice: What is the solution of the system? Use substitution. Check your answer.
4y + 3 = 3y + x
2x + 4y = 18
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Using Systems of Equations (pg. 374)
Example: A snack bar sells two sizes of snack packs. A large snack pack is $5, and a small snack pack is $3. In one day, the snack bar sold 60 snack packs for a total of $220. How many small snack packs did the snack bar sell?
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Practice: You pay $22 to rent 6 video games. The store charges $4 for new games and $2 for older games. How many new games did you rent?
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Systems with Infinitely Many Solutions or No Solution
(pg. 374)
If you get an identity (true statement), like 2 = 2, when you solve a system of equations, then the system has infinitely many solutions.
If you get a false statement, like 8 = 2, then the system has no solution.
Example: What is the solution of the system? Use substitution.
x = ‐2y + 4
3.5x + 7y = 14
Solving Systems by Substitution Part 2
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Example: What is the solution of the system? Use substitution.
y = 3x ‐ 11
y ‐ 3x = ‐13
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Practice: What is the solution of the system? Use substitution.
y ‐ 6x = 4
6x ‐ y = 4
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Solving Systems by Substitution Part 2
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Solving Systems by Substitution Part 2
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y = 2x + 4y = 6x 3
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Solving Systems by Substitution Part 2
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HOMEWORK: pg. 375 #12, 15, 18, 24, 28, 30, 33, 36