## Real Functions: Linear Functions

A linear function is defined by

y = mx + b

where:

- m = slope of line

- b = y-intercept (point of intersection with y-axis when x = 0)

- Identity function is a special case of a linear function with m = 1 and b = 0.

- Constant functions are special cases of linear functions with m = 0 and b = c where c = constant function value

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