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Section 1-1 Using Variables
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What is a variable Variable Rate Mortgage? Variable Interest Rate?
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What is a variable? In mathematics it’s a symbol, usually a letter, that represents different numbers
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What is an Expression? According to answers.com
The act of expressing, conveying, or representing in words, art, music, or movement; a manifestation: an expression of rural values.
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What is an Expression? Mathematical phrase that includes numbers, variables, and operation symbols
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Then what is an Equation? What is the difference?
An equation is an expression with an equals sign Does anyone know what this is?
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Example How about: 12 minus m? Is it: 12 – m or m – 12?
It’s actually 12 – m
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Books out Let’s open our books to page 5 and look at Example 3.
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Example - #18 The perimeter of a square equals 4 times the length of a side. Answer: Define Variables: p = perimeter and s = length of a side Equation: p = 4s
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Example - #22 First Define the Variables: n = number of tapes c = cost
Which is dependent on the other? Which variable needs the other to tell them how to act?
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Example - #22 Number of tapes is independent Cost is dependant
What does that mean? It means you need the number of tapes to figure out the cost.
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Example - #22 C = 8.5n Because the cost increases each time by $8.50 for each tape.
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It’s Homework Time Please spend the first 10 minutes working quietly
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