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The relation y=x is not a function

User Rivasa
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Answer: False

The relation y = x is a function. The graph passes the vertical line test. Any input x in the domain leads to exactly one and only one y output in the range.

Furthermore, this function is one-to-one because each output pairs with a unique input.

Further info: domain and range are both "all real numbers".

User Prakash Boda
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