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Lesson 1-6/ 1-7 Writing Algebraic Expressions

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To evaluate an expression, substitute a number for a variable Example 1: Evaluate 3n + 7 when n = 3

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Example 2: Evaluate n ÷ 2 + n when n = 4 (use PEMDAS)

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Example 3: Evaluate 9 + 3p – 5t + 3 when p = 2 and t = 1 (use PEMDAS)

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Example 4: Evaluate m² + y/5 when m = 2 and y = 35 (use PEMDAS)

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How would you write this expression out in words? n + 25

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Operation Key Words + Add More than Sum Increased by - Subtract Minus Difference of Less than Take away Decreased by x Times Multiplied by Product of ÷ Divided by Quotient

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Sum

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Less than

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Product

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More than

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Difference

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Increased by

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Write each phrase as an algebraic expression Example 5: 4 more than a number Example 6: the product of 20 and t

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Write each phrase as an algebraic expression Example 7: the sum of 4 times a number and 2

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Write each phrase as an algebraic expression Example 8: 4 times the sum of a number and 2

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Write each phrase as an algebraic expression Example 9: m plus the product of 6 and n

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Write each phrase as an algebraic expression Example 10: 14 less than the quantity k times 6

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