Algebra I: Identify if the graph is a function or not
This is a free lesson from our course in Algebra I
 
   
In this lesson you'll learn how to determine if a graph is a function or not. You'll also learn about the Vertical Line test, which is used to determine whether a relation is a function or not. In this test, if you can draw a vertical line on the graph of a relation such that it intersects the graph at more than one points, then the relation is not a function, otherwise it is a function.E.g. Determine whether the relation represented in the graph is a function. Identify the domain and range, if it is a function.
(More text below video...)
<h2> Identify if the graph is a function or not - Watch video (Algebra I)</h2> <p> function, graph, determine, relation, example, line, points, vertical line test, intersect, practice questions, quizzes</p> <p> You&rsquo;ll also learn about the Vertical Line test, which is used to determine whether a relation is a function or not.</p>
Other useful lessons :
Types of functions
One to many relationship
Finding the domain of function
Finding the domain and range of the functions
(Continued from above) Solution:
      a relation is a function if every input has exactly one output.
      in the plot, for each x-coordinate, there is only one y-coordinate.
      so, the relation is a function.
      the domain is 1, 2, 3, 5 and 6 and the range is 2, 3, 4, 6 and 7. [The x-coordinates of the points are the domain and the y- coordinates are the range.]
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