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Variables and Patterns

Variables and Patterns. Rules and Equations Investigation 3. 3.1 Writing Equations Equations with One Operation. KeY VoCaBuLaRy. Rule Tells you how to find the value of a variable (usually written in words).

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Variables and Patterns

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  1. Variables and Patterns Rules and Equations Investigation 3

  2. 3.1 Writing Equations Equations with One Operation KeY VoCaBuLaRy Rule Tells you how to find the value of a variable (usually written in words). Equation A rule containing variables that represent mathematical relationships. Ex: The cost in dollars is equal to 21times the number of people. (Rule) C =21●p (Equation) C =21●p How much will it cost for 20 people? C =21●p C=21●20 C= $420

  3. 3.2 Writing More Equations Equations with Two Operations • Steps in Writing Equations • Create a rule. • Develop an equation from the rule. Example: A cell phone plan costs $5.00 for monthly access and .10 cents per minute. Write an equation. How much will it cost if you used 50 minutes? A cell phone plan costs$5.00 for monthly access and.10 cents per minute (Rule) C = $5.00+.10m (Equation) C=$5.00+.10m

  4. 3.3 Paying Bills and Counting Profits Equations for Revenue, Expenses, and Profit • Steps for writing a rule from a chart • Look for a pattern of increase or decrease and how it relates. • Create the rule. • Make the equation. Profit = Income – Expenses Camp Income and Costs Income: Pattern – it increases by 335 per camper. The income increases by 335 per camper. (Rule) I = 335c (Equation) I=335c

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