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How You Know How To Use A Variable Inan Addition Or Subtraction Expression?

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When you first began to learn addition and subtraction facts, you were faced with problems like   1 + 2 = __ or    1 + __ = 3 In algebra, we give a name to the blank. We call it a variable and we represent it with a letter or word or other symbol.   1 + 2 = x or   1 + y = 3 You use a variable wherever you want to represent an unknown quantity. You use the same variable whenever you want to represent the same number, and a different variable when you want to represent a different number. Example   x + x = 6    (a number added to itself is 6)   x + y = 9    (the sum of two numbers is 9)

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