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Earn +20 ptsQ: What is the definition of an equivalent variable expressions?
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Do algebraic expressions have to have a variable?
Yes. That is the definition of an algebraic expression.
What is the definition of equivalent numerical expressions?
That means that the two expressions represent the same number.
How are equivalent expressions used?
You can use them to find a variable. Lets say you have two equivalent expressions with the same variable... x + 2x - 42 = 0 2x - 28 = 0 If you combine these equivalent expressions you ahve... x + 2x - 42 = 2x - 28 In all of the expressions you have x = 7 There are also other applications but its confusing to explain.
Two algebraic expressions are if they have the same value for all values of their variable?
They are identical or equivalent.
What is the definition for defining the variable?
choosing a variable to represent one of the unspecified numbers in a problem and using it to write expressions for the other unspecified numbers in the problem.
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