Posted by DJ on Friday, January 9, 2009 at 1:00am.
What is the difference between a expression and a equation?

math  Chopsticks, Friday, January 9, 2009 at 1:04am
Equation has an = sign and expression doesnt?

math  drwls, Friday, January 9, 2009 at 1:06am
An expression is just an algebraic formula, like a + bx. It contains no equals (=) sign . An equation states that one algebraic expression equals another (or a number), and it has an = sign between the two expressions.
You could 2 + 2 = 4 is an equation, but it is a special kind called an identity, since it is always true.