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Added explanation for single y intercept (#31540)

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Tammy Lee
2019-04-13 06:21:42 -07:00
committed by The Coding Aviator
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commit a77d7c0cf6
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guide/english/mathematics/x-and-y-intercepts/index.md
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@ -7,7 +7,7 @@ The X intercept(s) are the point(s) on the X axis where the graph of the functio
The Y intercept is the point at which the graph of the function crosses the Y axis. It occurs where ```x = 0```.
A function can have multiple X intercepts, but can only have a single Y intercept.
A function can have multiple X intercepts, but can only have a single Y intercept. Why is only a single Y intercept allowed? By definition, a function can only have one output, y, for each unique input, x. Thus, a graph would violate this definition if ```x = 0``` produced more than one output, y.
To find the X intercept(s), set ```y = 0``` and solve the equation for x.