https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:evaluating-functions/v/what-is-a-function 2021-06-30T18:10:09Z What is a function? Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions. Sal Khan video https://cdn.kastatic.org/googleusercontent/whRX1xQJEDdGcWfqUl8w5525C24vlDY-jZPlw-V9OTDxzG7Adv25nPLwbaP1FKUH4HK6R7YTRYoSCB9n4fLieb7A What is a function? Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions. https://cdn.kastatic.org/ka-youtube-converted/kvGsIo1TmsM.mp4/kvGsIo1TmsM.mp4 477 Relations and functions https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:relations-and-functions-ncert-new/x0419e5b3b578592a:functions/e/check-whether-the-relation-is-a-function 2026-05-12T22:10:47.015864082Z Check whether the relation is a function Test whether the given relation is a function or not exercise https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:recognizing-functions/e/recognizing_functions 2026-05-04T16:10:46.51963925Z Recognize functions from tables Determine whether a table of values of a relationship represents a function. Tomer Gal exercise https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:recognizing-functions/v/graphical-relations-and-functions 2021-06-30T18:10:09Z Recognizing functions from graph Checking whether a given set of points can represent a function. For the set to represent a function, each domain element must have one corresponding range element at most. Sal Khan video https://cdn.kastatic.org/googleusercontent/Xx6kiGJjio_FaPEf-pejwFmHpp0eAvdClgbusZKQwmwE0oAI8EZv2SmDGHw1vHoBQtuwubAp11LwfP6m2tojnb9c Recognizing functions from graph Checking whether a given set of points can represent a function. For the set to represent a function, each domain element must have one corresponding range element at most. https://cdn.kastatic.org/ka-youtube-converted/qGmJ4F3b5W8.mp4/qGmJ4F3b5W8.mp4 247 Relations and functions https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:recognizing-functions/e/recog-func-2 2026-05-04T16:10:46.51963925Z Recognize functions from graphs Determine whether a given graph represents a function. Tomer Gal exercise