What is a variable? A variable represents an unknown value.

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Presentation transcript:

Objective - To recognize and evaluate variable expressions and basic formulas. What is a variable? A variable represents an unknown value. 1) 3 + ___ = 10 2) 6 + = 9 These are all variables 3) 8 + x = 12 4) 5 + = 8

Variable Expressions Variable expressions consist of constants, variables, and operations. Example Meaning Operation

Evaluate the expression if a = 3, b = 4, and c = 5 1) ab - c 3) (3)(4) - 5 2(3) + 4 2 12 - 5 6 + 4 2 6 + 2 = 8 7 2) 2a(b - c) 4) 2(3)(4 - 5) 2(4 + 5) 2(3)(-1) 3 2(9) 18 -6 = = 6 3 3

Formulas Formula - an equation which defines the relationship of one variable to other variables or numbers. Travelling to Las Vegas at an average speed of 60 miles/hour takes 5 hours. How far is Las Vegas?

Perimeter Perimeter - Distance around a geometric figure. Find the perimeter of the triangle below.

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram w l

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram h b

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram h b

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram 8 h 7 b 10 Triangle

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram 8 h 7 b 10 Triangle h b

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram 8 h 7 b 10 Triangle h b

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram 8 h 7 b 10 Triangle h b

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram 8 h 7 b 10 Triangle h b

Area Formulas Find the area Rectangle w 4 l 5 Parallelogram 8 h 7 b 10 Triangle 7 h 5 b 8