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A constant function is a linear function whose graph has a slope of $0.$ An example is the function $y=2.$
The equation of a constant function can always be written on the form $y=b,$ where $b$ is the $y$-intercept. Constant functions typically do not have $x$-intercepts. The only exception is the function $y=0,$ which has an infinite number of $x$-intercepts.