College Algebra / Alg 243 · Atom · ~20 seconds
The Horizontal Line Test
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The horizontal line test reads a graph for one-to-one: if any horizontal line crosses more than once, some output belongs to two inputs.
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On y = x², the horizontal line y = 4 hits (2, 4) and (−2, 4) — a function, but not one-to-one.
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