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Lesson 1.3 Variables and Expressions

Lesson 1.3 Variables and Expressions. By Yeo Chang Yoon. Vocabulary 1. Variable: A variable is a symbol or a letter, that represent one or more numbers. Vocabulary 2. Variable expression: It is an expression that consists of numbers, variables, and operations.

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Lesson 1.3 Variables and Expressions

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  1. Lesson 1.3 Variables and Expressions By Yeo Chang Yoon

  2. Vocabulary 1 Variable: A variable is a symbol or a letter, that represent one or more numbers.

  3. Vocabulary 2 Variable expression: It is an expression that consists of numbers, variables, and operations.

  4. How to evaluate a variable expression To evaluate a variable expression, substitute a number for each variable. Then find the value of the numerical expression.

  5. Using a Variable Expression If a car travels 80 kilometers per hour, what is the distance the car will travel in 5 hours? Speed X Time=80t =80(5) =400 Answer: The car will travel 400km.

  6. Evaluating Variable Expressions Evaluate the expression when x=10 and y=5. • 45x+5=45(10)+5 2. 4y+5=4(5)+5 =450+5 =20+5 =455 =25

  7. Translating Verbal Phrases Verbal Phrase Variable Expression The sum of a number and 2 n+2 The difference of a number and 5 n-5 The product of 10 and a number nX10 The quotient of 48 and a number 48/n One Third of a number 1/3n

  8. Writing and Evaluating an Expression To find the average weight of a male person whose height is 150cm or over, subtract 100 from the height and multiply 0.9. Find the average weight of a boy whose height is 160cm. 0.9(h-100)=0.9(160-100) =0.9(60) =54 Answer: The average weight of the boy is 54kg.

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