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what is a algebraic expression

Today in class we learned about algebra and one of the vocabulart words was algebric expression and we need to know what it means for a test tommorow PLEASE HELP ME!!!!! ASAP
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An algebraic expression is a mathematical phrase that can contain ordinary numbers, variables (like x or y) and operators (like add,subtract,multiply, and divide).
Here are some algebraic expressions: 


 2 - b


 y -2 / b
In the above expression the "/" means divide. The "3x" means multiply the variable x by 3.