Is This a Function? How to Identify a Function Using Points on the Graph

Learn to determine whether a set of points or ordered pairs represents a function in this 18-minute algebra tutorial. Master the fundamental concept of what makes a relation a function by analyzing ordered pairs and points on the coordinate plane using concrete, practical rules that can be applied quickly during tests. Discover the key rule for identifying functions, understand common student mistakes, and see how this foundational skill appears on Algebra 1 exams, college placement tests, and standardized assessments like the SAT, ACT, GED, HiSET, ASVAB, and ACCUPLACER. Practice analyzing sets of points to determine if they represent functions before watching the step-by-step explanations, making this abstract mathematical concept concrete and accessible for middle school, high school, and college students, as well as homeschool learners and adults rebuilding their math fundamentals.