1. 9/28/12 - Simplify. 1. 2y + 4 – 3y – 5 2. -7(2t + 1) + 10 = -1y – 1 = -14t + 3 HW check today! This is Sheet #2!

2. Mrs. Spanier Algebra 1

3. Think About… Why is 2x + 1 = 5 called a “2-step” equation?

4. Ex. 2x + 1 = 5 Why 2 steps? It takes 2 steps to solve an equation with 2 operations. –First: Solve addition or subtraction. –Second: Solve multiplication or division. Work your way towards the variable.

5. Problem 1 2x – 11 = 5 + 11 +11 + 11 +11 2x = 16 2x = 16 x = 8 x = 8 Add 11 Divide by 2 Solution is x=8 ___ 2 2

7. Problem 2 67 = 11y + 1 -1 -1 -1 -1 66 = 11y 6 = y 6 = y Subtract 1 Divide by 11 Solution is y=6 ___ 11 11

8. Problem 3 3r – 8 = -35 3r – 8 = -35 +8 +8 +8 +8 3r = -27 3r = -27 r = -9 r = -9 Add 8 Divide by 3 Solution is r = -9 ___ 3 3

9. Problem 4 10 = -7 + c 10 = -7 + c +7 +7 +7 +7 17 = c 17 = c c = 34 c = 34 Add 7 Multiply by 2 __ 2 __ 2  2 2 

10. Problem 5 24 = 4 – 2t 24 = 4 – 2t -4 -4 -4 -4 20 = -2t 20 = -2t t = -10 t = -10 Subtract 4 Divide by -2 ___ -2 -2

11. Before you go… Tell someone in your group how you know what to do first.

12. The End