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# 7th pre alg -l89--day2

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### 7th pre alg -l89--day2

1. 1. Lesson 89.Day2.notebook April 29, 2014 Assignment: 1-->System of equations Handout #2 - Due Tomorrow [4/30] 2-->Test #13 - Tuesday [5/6]
2. 2. Lesson 89.Day2.notebook April 29, 2014 Lesson 89 (Day 2) WarmUp: Find the volume of #1 & 2 1) 2) 3) Solve: 4(x - 3) + 5 = x + 2 4) The baby's weight increased from 15 to 21 pounds in 3 months. What was the percent of increase? 5) Solve for y: y - 8 = 2x - 3 4 in 6 in 6 in 4 in
3. 3. Lesson 89.Day2.notebook April 29, 2014 Lesson 89 - Day 2 *Another way to solve SYSTEMS OF EQUATIONS is by using "substitution"! Steps for using SUBSTITUTION: --Isolate one of the equations for ONE of the variables --Plug that "value" into the other equation and solve --Plug this solution into the 2nd equations and solve. --Write the solution as an ordered pair
4. 4. Lesson 89.Day2.notebook April 29, 2014 EX--> x + y = 6 y = x + 10
5. 5. Lesson 89.Day2.notebook April 29, 2014 Examples - Lesson 89 Solve each system of equations by Substitution. Check the solution. A) y = x - 5 x + y = 3
6. 6. Lesson 89.Day2.notebook April 29, 2014 B) x + y = 6 x - y = -10
7. 7. Lesson 89.Day2.notebook April 29, 2014 C) x + y = 6 y = x
8. 8. Lesson 89.Day2.notebook April 29, 2014 D) y = x - 6 x + y = 0
9. 9. Lesson 89.Day2.notebook April 29, 2014 E) y = -x + 1 y = x + 5