► My Precalculus course: https://www.kristakingmath.com/precalculus-course
The vertical line test is a visual test you can use to say whether or not a graph represents a function.
Remember that a function is a special type of equation in which there is always only one unique output value y for every input value x. If there is a value of x that you can plug into an equation that produces more than one output value of y, then the equation is not a function.
Visually, if you look at any graph in an xy-coordinate system, and if you can draw a perfectly vertical line that crosses the graph in more than one place, then you know that the graph doesn't represent a function. In other words, a graph must pass the "vertical line test" in order to be considered the graph of a function, instead of just the graph of an equation.
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Hi, I’m Krista! I make math courses to keep you from banging your head against the wall. ;)
Math class was always so frustrating for me. I’d go to a class, spend hours on homework, and three days later have an “Ah-ha!” moment about how the problems worked that could have slashed my homework time in half. I’d think, “WHY didn’t my teacher just tell me this in the first place?!”
So I started tutoring to keep other people out of the same aggravating, time-sucking cycle. Since then, I’ve recorded tons of videos and written out cheat-sheet style notes and formula sheets to help every math student—from basic middle school classes to advanced college calculus—figure out what’s going on, understand the important concepts, and pass their classes, once and for all. Interested in getting help? Learn more here: http://www.kristakingmath.com
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Tagged under: calculus,expert,precalculus,Krista King,functions, ,vertical line test,educational
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