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A vertical line cuts a graph at two points. What does the vertical line test say?
AThe graph is not a function
BThe graph is not one to one
CThe graph has no y-intercept
DThe graph has no real domain
Answer & Solution
Correct answer: A. The graph is not a function
1. A vertical line collects every point of the graph that shares one input value.
2. Two points on that line means one input has produced two different outputs.
3. A function allows only one output per input, so the graph does not define a function.
_Source: OpenStax College Algebra (CC BY 4.0), section 3.1 Functions and Function Notation_
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