SOLUTION: determine whether this equation is a function of x? show your work 4x=y2

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Question 336047: determine whether this equation is a function of x? show your work 4x=y2
Answer by jrfrunner(365) About Me  (Show Source):
You can put this solution on YOUR website!
by definition, y=f(x) can be a function if for each x value there can be only one y.
The vertical line test, is that if you plot y and you can draw a vertical line and touch more than one y point, it is not a function.
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if you solve 4%2Ax=y%5E2 for y, you get y=-2%2Asqrt%28x%29 and y=2%2Asqrt%28x%29, which violates the definition of a function, more than one y for each x.