7th pre alg -l89--day2

Lesson 89.Day2.notebook April 29, 2014

Assignment:

1-->System of equations Handout #2 - Due Tomorrow [4/30]2-->Test #13 - Tuesday [5/6]


Lesson 89 (Day 2) WarmUp:Find the volume of #1 & 21)

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


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


EX--> x + y = 6y = x + 10


Examples - Lesson 89Solve each system of equations by Substitution. Check the solution.A) y = x - 5

x + y = 3


B) x + y = 6x - y = -10


C) x + y = 6y = x


D) y = x - 6x + y = 0


E) y = -x + 1y = x + 5

7th pre alg -l89--day2

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