**Additional Materials**

**Materials Required**

**Estimated Time Needed**

*(Times are approximate and will depend on the needs of the students.)*

Solving Linear Equations in Two Variables

Academic

Vocabulary

Vocabulary

An expression that contains one or more numbers, one or more variables, and one or more mathematical operations.

Mathematical sentence that compares two expressions linked by an equals sign.

A problem-solving strategy that students can use to solve mathematical problems by guessing the answer and then checking that the guess fits the conditions of the problem.

An algebraic equation, such as y = 2x + 7 or 3x + 2y - z = 4, in which the highest degree term in the variable or variables is of the first degree. The graph of such an equation is a straight line if there are two variables.

Letters that represent numbers in algebraic expressions; called variables because the numbers they represent can vary; one or more numbers can be substituted for the letters in an algebraic expression; also referred to as the unknown.