Objective
To write algebraic expressions
Using Variable Expressions
A mathematical quantity is anything that can be measured or counted. Some quantities remain constant. Others change, or vary, and are called variable quantities.
Essential Understanding Algebra uses symbols to represent quantities that are unknown or that vary. You can represent mathematical phrases and real-world relationships using symbols and operations.
A variable is a symbol, usually a letter, that represents the value(s) of a variable quantity. An algebraic expression is a mathematical phrase that includes one or more variables. A numerical expression is a mathematical phrase involving numbers and operation symbols, but no variables.
What is an algebraic expression for the word phrase?
Word Phrase | Model | Expression |
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A 32 more than a number n |
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B 58 less a number n |
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How can a diagram help you write an algebraic expression?
Models like the ones shown can help you to visualize the relationships described by the word phrases.
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