00:01
So we have three vocabulary terms, a variable, a variable expression, and an equation.
00:09
Now, some of these are used interchangeably by some people, but although they're related, their actual definitions are different.
00:20
So it's important to know what these words really mean.
00:26
So a variable is a symbol used to represent an arbitrary value.
00:32
So what does arbitrary mean? well, it means random.
00:37
So that means that we don't know exactly what number the variable represents, but it's basically a placeholder for some random value.
00:52
So variables are typically represented by letters.
00:57
Those are the symbols we typically use to represent them.
01:00
And these could be letters like x, y, a, b, k, letters like that.
01:15
And those are some of the most common ones, but really you could use any letter to represent a number.
01:26
Okay.
01:27
So now we're going to go on to a variable expression.
01:33
So a variable expression is basically a mathematical phrase that can combine numbers, variables, and operators to show the value of something...