Algebra<span><span>Introduction to Algebra </span>Variables<span> </span>Expressions<span> </span>Equations<span> </span>Solution of an equation<span> </span>Simplifying equations<span> </span>Combining like terms<span> </span>Simplifying with addition and subtraction<span> </span>Simplifying by multiplication<span> </span>Simplifying by division<span> </span>Word problems as equations<span> </span>Sequences VariablesA variable is a symbol that represents a number. 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. ExpressionsAn expression is a mathematical statement that may use numbers, variables, or both.Example:The following are examples of expressions:2x3 + 72 × y + 52 + 6 × (4 - 2)z + 3 × (8 - z<span>)</span></span>
