Posted by **trudy** on Thursday, October 7, 2010 at 11:05pm.

Functions are a lot like equations. In a function we look at the relationship of the variables. Does one variable depend on the other.

In a function when you see f(x) it just means "y." So we have an equation y = 2x + 3 and a function that is

f(x) = 2x + 3. When graphed, they both look like the same line.

What makes these a linear equation or a linear function? How can we tell if they are linear?

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