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Tools for Algebra Vocabulary OCS Algebra I Mrs. Bonifay Order of Operations Rules that tell you which operations to do first Variable A letter that represents a number EXAMPLE: In 3 + a = 15, “a” is the variable. TERMS Parts of an expression separated by an operation sign EXAMPLE: In 3a + 7, “3a” and “7” are terms CONSTANTS Numbers, or quantities, that do not change EXAMPLE: In 4 + b, “4” is a constant COEFFICIENT A number that multiplies a variable EXAMPLE: In 3a, “3” is the coefficient LIKE TERMS Terms that have the same variables with the same exponents EXAMPLE: In 3a + 4 + 2a, “3a” and “2a” are like terms SUBSTITUTE Replace a variable with a number expression 3a + 6 = y a=3 EQUATION A statement that two expressions are equal EXAMPLE: 3a + b = 12 is an equation Expression a group of terms (the terms are separated by operation signs) 3a + 5b + 7