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YouTubeBill Kinney
Is This Function ONE-to-ONE? (Horizontal Line Test Explained!)
In this short lesson, I explain why a graph that rises and falls cannot be one-to-one. Using the horizontal line test, we see that different x-values (like around 3 and 4.2) give the same output, which means the function fails the test and does not have an inverse. Great for algebra, precalculus, and early calculus students. A function is one ...
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