A constant function is a function whose output value y is the same for every input value x. Its graph is a horizontal line that has a slope of 0. This algebra-related article contains minimal information concerning its topic. You can help the Mathematics Wikia by adding to it. Retrieved from "https://math.wikia.org/wiki/Constant_function?oldid=16819" Categories: Algebra stubs Functions Community content is available under CC-BY-SA unless otherwise noted.