# Algebra- Addition and Subtraction

Topic: Algebra What is algebra?

**Algebra** is a branch of math where you to use symbols, usually letters of the alphabet, to

solve problems.

These letters, or symbols, are placed in the problem to show an unknown.

Every algebraic equation has the following parts:The EquationOne of the basic concepts of algebra is the equation. The main thing to know about an equation is that everything on one side of the equal sign (=) must equal everything on the other side of the equal sign.The VariablesVariables are things that can change or have different values. In algebra, we are usually trying to find the value of one or more variables. In algebraic equations, the variable is represented by a letter. Usually variables will be represented by the letters "x" and "y" but any letter can be used. Addition and Subtraction Algebra?

Remember: When trying to solve simple equations, we add or subtract both sides, look at the example below:x + 5 = 7Since we are solving for "x", we have to rearrange the equation so that "x" is on a side by itself. Subtract5from the left side,xwill be by itself. Following our earlier rule, we need to do the same to right side.(x + 5) - 5 = (7) - 5x = 2