2.  What is Algebraic Expressions and how do I solve them?

3.  Algebraic Expressions- an expression containing numbers, variables, and operations (eg, 3x + y or 5a – 4). Algebraic expressions do not contain equality or inequality symbols.  Variables- a symbol for a number we don't know yet.  Expressions- a mathematical term or a sum or difference of mathematical terms that may use numbers, variables, or both.  Equation- a statement that two numbers or expressions are equal

4. Usually we use letters such as n, t, or x for variables. For example, we might say that s stands for the side- length of a square. We now treat s as if it were a number we could use. The perimeter of the square is given by 4 × s. The area of the square is given by s × s. When working with variables, it can be helpful to use a letter that will remind you of what the variable stands for: let n be the number of people in a movie theater; let t be the time it takes to travel somewhere; let d be the distance from my house to the park.

5.  3 + 7  2 × y + 5  2 + 6 × (4 - 2)  z + 3 × (8 - z )

6.  Equations are useful for relating variables and numbers. Many word problems can easily be written down as equations with a little practice. Many simple rules exist for simplifying equations.  17 = 2 + 15  x = 7  7 = x  t + 3 = 8  3 × n +12 = 100

7.  To solve an expression for a given value for the variable, plug the value of the variable into the expression and simplify using the correct order of operations.  Question: If n = 125.17, what is the value of 256.39 - n? Answer: Simply plug in the number for n and solve the expression.256.39 - n = 256.39 - 125.17 = 131.22

8.  If n = 81, what is the value of n ÷ 9?  If n = 590, what is the value of n - 352?  If n = 91, what is the value of 186 + n ?

9.  Tell a partner : How you solve an Algebraic Expression?

10.  Algebraic Expression Worksheet