S OLVING E QUATIONS ( REVIEW ) 8 th Grade: Pre-Algebra.

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Presentation transcript:

S OLVING E QUATIONS ( REVIEW ) 8 th Grade: Pre-Algebra

C HECK HW

V OCABULARY Equation Solve Solution Inverse Operation Isolate the Variable Addition Property of Equality Subtraction Property of Equality Division Property of Equality Multiplication Property of Equality

P ROPERTIES OF A DDITION & M ULTIPLICATION Associative Property of Addition: (a + b) + c = a + (b + c) Associative Property of Multiplication: (a x b) x c = a x (b x c) Commutative Property of Addition: a + b = b + a Commutative Property of Multiplication: a x b = b x a

M ORE P ROPERTIES Distributive Property: a x (b + c) = (a x b) + (a x c) Identity Property of Addition: 0 + a = a Identity Property of Multiplication: 1 x a = a Inverse Property of Addition: a + (-a) = 0 Inverse Property of Multiplication: a x 1/a = a/a = 1 when a ≠ 0

S OLVING ONE - STEP EQUATIONS A. n + 9 = 27 B y = 55 C. 67 = 51 + x D. h – 12 = 18 E. r – 11 = 28 F. c – 7 = 21 G. 5 + x = 23

S OLVING MORE ONE - STEP EQUATIONS A. 2x = 14 B. w/5 = 11 C. 3h = 45 D. x/4 = 36 E. x/3 = 9 F. 6d = 66 G. r/4 = 7 H. 7d = 12

R EMEMBER I NTEGER R ULES A. 2z = -6 B. C. -6k = 54 D. -8d = -12 E. -p = -34 F. -w = 17 G. -t = 62 H. -y = -16

R EVIEW SOLVING ONE - STEP EQUATIONS 1. 5y = z – 15 = x + 4 = d = 4 3. d – 11 = t = b = 12 7.

S OLVING T WO -S TEP E QUATIONS A. 6x – 4 = -34 B. 5y – 3 = 32 C. 8 – t = 1 D. 10p – 6 = -36 E. 11 – 9m = -70 F. 4x – 12 = 24

H OMEWORK P RACTICE Pre-Algebra Textbook: Page 16 (21-35) Page 21 (29-36)