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anonymous
 one year ago
how do I know when a parabola is or isn't a function?
anonymous
 one year ago
how do I know when a parabola is or isn't a function?

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Zale101
 one year ago
Best ResponseYou've already chosen the best response.2By the vertical test, you can determine which functions are and not a function.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and a vertical test is when...?

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2The vertical line test determines if the graph passes vertical lines only 1, but not twice. For example, if we have a parabola. dw:1441659261950:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2The y values gets to be passed once when doing the vertical line test (refer to the bold dots)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0the parabola must open up or down. it cannot be rotated on any direction

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2But if we have a side ways parabola. dw:1441659344699:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2The function does not pass the vertical line test because 2 y values are touched by the same x value.

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2Therefore, the sideways parabola is not a function.

amistre64
 one year ago
Best ResponseYou've already chosen the best response.0a parabola is always a function .... its equation is not necessarily based on a coordinant axial system

amistre64
 one year ago
Best ResponseYou've already chosen the best response.0x = 4y^2 is a parabolic function. dw:1441660077511:dw

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2The graph of x=4y^2 is sideways parabola but narrower. No?

amistre64
 one year ago
Best ResponseYou've already chosen the best response.0no, you see that I have drawn the y axis as the horizontal, and the x axis is vertical ... making y independant, and x dependant. 'sideways' is not relevant ... all parabolas can be oriented to open upward or downward

amistre64
 one year ago
Best ResponseYou've already chosen the best response.0dw:1441662415252:dw move the vertex to the origin, and rotate the 'graph'

amistre64
 one year ago
Best ResponseYou've already chosen the best response.0im sure the question did not have this in mind ... but still

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2Oh yes, i noticed the change of the axis xD
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