SOLUTION: what is the difference between a variable, a variable expression, and an equation?

Question 259048: what is the difference between a variable, a variable expression, and an equation?
Found 2 solutions by drk, richwmiller:
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
A variable is just any letter of the alphabet that stands for some unknown amount. X and Y are the most common variables.
EX: X
--
A variable expression is numbers, letters, +,-, x, /, signs, but NO EQUAL sign.
EX: 2x^2 - 3x + 43
--
An equation contains an equal sign somewhere
EX: 5 + x = 10
EX: x^2 + 2x + 4 = 0
EX: 2x^2 + 5y^2 = 1
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
An equation equates (with an equal sign) two things whether they be variables , expressions or constants.
A variable is an unknown quantity denoted by a letter.
A variable expression is a variable and/or constant with a mathematical operation such as addition or division.
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