Equation Explorer

A variable is a symbol (usually a letter like x, y, or z) that represents an unknown value.

Example: x + 5 = 12

Here, x is the variable we need to find.

To form an equation from a real-life situation:

1. Identify the unknown value
2. Assign a variable to it
3. Express the relationship using mathematical operations

To solve an equation:

1. Isolate the variable on one side
2. Perform the same operation on both sides
3. Simplify until you find the value of the variable

Problem: John is 5 years older than Mary. If John is 15 years old, how old is Mary?

Let x = Mary's age

John's age = x + 5

x + 5 = 15

x = 10

Mary is 10 years old.