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1.1– Variables and Expressions variable – letter or symbol used to represent a value that can change constant – value that does not change numerical expression – collection of numbers operations and grouping symbols algebraic expression – mathematical sentence containing variables evaluate – find the value of an expression Ex. – Evaluate the expression for x = 8 and y = 5 x+y 8 + 5 = 13 Translating Words into Symbols Addition Plus Sum Increased by More than x plus 6 The sum of x and 6 A number increased by 6 6 more than a number Subtraction Difference Decreased by Minus *Less than The difference of a number and 7 A number decreased by 7 A number minus 7 7 less than a number x+6 x-7 Multiplication Times Product Of 6 times a number Product The product of 6 and a number 1 of a number 2 6x x 2 Division Divided by A number divided by 4 Quotient of The quotient of a number and 4 x 4 **The phrases “a number” or “some number” refer to the variable