Directions: Directions: Complete each statement by writing the missing word/ phrase on the blanks. 1. An expression is to a phrase as an equation is to a 2. The value of the variable that makes the equation true is called a of the equation. 3. are equations having the same solutions. 4. An equation of the form ax + b = 0, where a and b are real numbers and a = 0, is said to be 5. The equal sign (=) was introduced by (1510-1558), an English mathematician, to mean that two expressions are names or descriptions of exactly the same object.​