Certain functions are linear. A linear function is a function that generates a straight line. Here are a couple of examples of linear equations:

y = 2x + 3

4a – 3a = 12

Generally, when you formally identify such equations, you use the following expressions:

y = mx + b

Ax + By = C

In these equations, y and x represent variables. You can view x as representing the domain value and y as representing the range value. In both cases, these are variable values. The other letters (m, b, A, B, and C), represent constant values. A constant value is a value you see literally expressed. In the first equation, 2 and 3 serve as constants. In the second equation, 4 and 3 furnish the constants.

The equation y = mx + b is known as the slope-intercept ...

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