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| PAGE: 20 | SET: Exercises | PROBLEM: 7 |
Vertical Line Test :
A curve in the 
plane is the graph of a function of 
if and only if no vertical line intersects the curve more than once.
Observe the graph.
Draw a vertical line along the 
axis, the line touches the curve more than once.
The graph of the function fails the vertical line test.
Hence by the definition of vertical line test, the graph is not a function of 
.
No, the graph is not a function of .
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