While all **linear equations** produce straight lines when graphed, not all **linear equations** produce **linear functions**. **In** order to be a **linear function**, a graph must be both **linear** (a straight line) and a **function** (matching each x-value to only one y-value).

Similarly one may ask, how do you know if its a linear equation?

There are actually multiple ways to check **if** an equation or graph is a **linear function** or not . First make sure that graph fits the equation y = mx + b . y = the point for y ; x = the point for x ; m = slope ; b = y intercept . By using this equation you'll be able to **tell if** it is a **linear** line or not .

What is an example of a linear equation?

**Example**: y = 2x + 1 is a **linear equation**: The graph of y = 2x+1 is a straight line. When x increases, y increases twice as fast, so we need 2x. When x is 0, y is already 1.

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