1. Algebra Review “Solving Equations” September 20 th 2010

2. Inverse Operations… To solve algebraic equations, we use inverse operations. To get the variable by itself, we do the opposite. –Ex: subtraction gets rid of addition multiplication gets rid of division Balancing the Equation… Whatever you do to one side, you must do to the other

3. One-Step Equations 3x = 12x – 5 = 2 x/2 = 61 + x = 4

4. Two-Step Equations 2x – 1 = 115 – 3x = 20

5. Multi-Step Equations 4( x – 1 ) = 202 ( 3x + 2 ) + 5 = 21

6. Equations w/ Variable on Both Sides 3x – 6 = 5x + 87x + 10 = x - 2

7. Solving Ratios

8. CLASSWORK 1) 7x = 358) 3( x – 2) = 3 2) x – 7 = 119) 12x -1 = 143 3) 2 – 3x = 1110) 7x + 2x – 3 = 24 4) 17x – 2 = 1511) 3x (4) + 5 = 41 5) 2x + 1 = 3x + 612) 2( x – 3) + x = 33 6) x – 4 – 7x = 213) 4 – 5x – 2 = 27 7) 14)

9. CLASSWORK Answers 1) x = 58) x =3 2) x = 189) x = 12 3) x = -310) x = 3 4) x = 111) x = 3 5) x = -512) x = 13 6) x = -113) x = -5 7) x = -414) x = 6