Introduction to Equations

An Equation is a statement which states that two expressions are equal

Example: 2+4=3+3

An Expression is a group of numbers and operators which have some value

A Variable is usually a letter which represents an unknown

In Equations we can identify the value of variables using the fact that both sides must be equal

Example: 2x+3 = 9

We can subtract 3 on both sides because the overall equation should remain equal by operating on Both Sides

2x = 6

We can also divide both sides while maintaining equality

x = 3

Knowing that both sides of an equation must be equal we can conclude that the value of the variable x in this case is 3