Why does the graph of y=√x not have a negative value of y? Is it

In which graph is y not a function of x? - Quora

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What are the points where the graph of a function intersects an axis? - Quora

If a line does not intersect the y-axis, will it therefore not be considered a function? - Quora

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Shouldn't y=sqrt(x) also have negative outputs and hence not be a function? - Quora

What is the cause of the “point” or “discontinuity” on graphs that appear to be out of place (not exactly at x=0, y=0)? - Quora

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Trigonometric Functions

What is the importance of a graph of a function? - Quora