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### High School Mathematics - 24.1 Test of Functions: Vertical Line Test

 The vertical line test One way to tell if a graph is a function is the vertical line test, which states that if it is possible for a vertical line to meet a graph more than once, the graph is not a function. Method to test a function: Draw a line parallel to the y-axis. If this line cuts the graph at one distinct point, then it is a function otherwise it is not a function.
 Q 1: A wave graph is a function.truefalse Q 2: A vertical line with x-intercept a has an equation of the form x = a. Is this line a function.noyes Q 3: A graph x = y2 is a function.yesno Q 4: If every vertical line intersect a graph in no more than one point, then the graph is the graph of a function.truefalse Question 5: This question is available to subscribers only! Question 6: This question is available to subscribers only!