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 January 31st, 2016, 06:56 PM #11 Senior Member   Joined: Oct 2013 From: New York, USA Posts: 637 Thanks: 85 y = x^2 is a function. x = y^2 is not a function because a value of x goes with two values of y. For example, (4, 2) and (4, -2) are both on x = y^2. Thanks from 123qwerty
January 31st, 2016, 09:04 PM   #12
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Quote:
 Originally Posted by skipjack What do you mean by "something like y = x^2"? The equation y = x^2 would be an acceptable function definition if a complete formal definition doesn't need to be given.
I was rather sleepy when I wrote this... I meant x = y^2 lol, sorry.

January 31st, 2016, 09:06 PM   #13
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Quote:
 Originally Posted by EvanJ y = x^2 is a function. x = y^2 is not a function because a value of x goes with two values of y. For example, (4, 2) and (4, -2) are both on x = y^2.
Yeah I know, I just made a stupid mistake when I typed that... It was late at night and I was sleepy, but I was waiting for my printer to finish printing my notes, so I decided to visit this site lol.

February 2nd, 2016, 07:45 PM   #14
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Quote:
 Originally Posted by 123qwerty By the way, just noticed v8archie and Country Boy are now in the Maths Team. Congrats!
I don't know what that means in practical terms, but thanks anyway.

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