15.5.1 Study: Equivalent Expressions Equivalent Expressions When two expressions are equivalent, they always have the same value. Study guide These are some examples of expressions. An expression is a mathematical statement that uses numbers, operations, letters, or a combination of all three. d - 7 8 + 1 4 When two or more expressions are equivalent, they have the same value. 4+2 +6 and 5 + 7 are equivalent expressions because they are both equal to 12. 5x and 5.xare also equivalent. Attempt 1 of 2 Check Your Understanding Match the equivalent expressions. 12 ? 100 - 88 7+9-1 ? 3x 3• ? 13 5+3 +5 ? 15 HINT SUBMIT