Determine which of the following equations is not a function of x.

A) x^2 - y = 6
B) y= 3x/x^2-4
C) x^2 - y^2 = 1
D) Square Root of 1-x^3 = y

When it says is not a "Function" what does it mean precisely? When a number is a Function of an equation?

Question

Determine which of the following equations is not a function of x.

A)  x^2 - y = 6   
B) y= 3x/x^2-4  
C)  x^2 - y^2 = 1   
D) Square Root of 1-x^3 = y

When it says is not a "Function" what does it mean precisely? When a number is a Function of an equation?

christos · Answer

I might be confuses because the terms are in english which is not my mother language and such

skullpatrol · Answer

Define "function"

christos · Answer

An activity or purpose natural to or intended for a person or thing.

christos · Answer

But I still dont get it :D

anonymous · Answer

Where are the equations?

christos · Answer

I will type them wait

hartnn · Answer

if you have 1 value of x for 2 values of y, then your relation is not a function.
example : x=y^2

hartnn · Answer

*2 or more

anonymous · Answer

its simply tells you to choose the right equation that satisfy x. or vice versa.

christos · Answer

A)  x^2 - y = 6   B) y= 3x/x^2-4  C)  x^2 - y^2 = 1   D) Square Root of 1-x^3 = y

anonymous · Answer

wheres the given?

christos · Answer

"Determine which of the following equations is not a function of x."  Thats the question

skullpatrol · Answer

Dictionary definition: An activity or purpose natural to or intended for a person or thing.

You need a Math dictionary definition

skullpatrol · Answer

Use your textbook or notes.

christos · Answer

I see where the fuction is getting at. F(x) and such

christos · Answer

If I have found the correct explanation that is

anonymous · Answer

when you put one value in independent variable and you get exactly one corresponding value of dependent variable that equation is called function otherwise not a function. in all the above given equations the equation that is not a function is (C) the rest are functions by definition.

christos · Answer

hmm

anonymous · Answer

i get it, first, isolate y. then substitute any number for x. lets say substitute 0 for comfort. then if the equation gives you two values. then, the equation is not a function of x.in your case. letter D is the correct answer(not a function of x). because it gives you -1 and +1 value. as for letter C. it gives you a imaginary number so its negletable.

skullpatrol · Answer

http://en.wikipedia.org/wiki/Function_(mathematics)

skullpatrol · Answer

https://www.youtube.com/watch?feature=player_embedded&v=VhokQhjl5t0

christos · Answer

@rizwan_uet  so how can you determine whenever it's possible to work with dependent/independent variables in one equation? May I assume that you "Can't" Work like that in C)  x^2 - y^2 = 1    because both variables have the power of 2?

christos · Answer

or generally both powers have a power greater than 1 ?

christos · Answer

Or are there any formulas that I can use to find out?

christos · Answer

Except if there is a simplier way ofcourse. The simplier the better

anonymous · Answer

heres my reference. http://answers.yahoo.com/question/index?qid=20080813053127AAPsnFy no theres no formula, just isolate y. use your algebra :)

christos · Answer

So Long Story Sort: Answer is C because Y is in the power of 2  



Correct?

christos · Answer

Short*