Answer
A variable is a letter that represents a number.
Examples::
$x, y, \text{ and } z$
An expression is a sum, difference, product, or quotient of numbers and variables/letters.
Examples:
$2x, 5x-3y, \text{ and } \frac{9x}{5}+2$
An equation is a mathematical statements that says two expressions are equal to each other.
Examples:
$2x=4
\\3x-5y=8
\\x^2-16=0$
Work Step by Step
A variable is a letter that represents a number.
Examples of variables are:
$x, y, \text{ and } z$
An expression is a sum, difference, product, or quotient of numbers and variables/letters.
Examples are:
$2x, 5x-3y, \text{ and } \frac{9x}{5}+2$
An equation is a mathematical statements that says two expressions are equal to each other.
Examples are:
$2x=4
\\3x-5y=8
\\x^2-16=0$
