- #1
Chrisistaken
- 12
- 0
Hi,
In school (I think) I recall there being a test for an equation which determined whether or not it was a valid 'something-or-other' and it was simply that if you could draw a vertical line anywhere on the graph of the equation, that crossed the line more than once, it was not a valid 'something-or-other'.
An example of an invalid equation would be: y = sqrt(x)
Does anyone know what the 'something-or-other' is? And if there is a term for these equations, what is it?
My apologies if this was just a figment of my imagination.
Regards,
Chris
In school (I think) I recall there being a test for an equation which determined whether or not it was a valid 'something-or-other' and it was simply that if you could draw a vertical line anywhere on the graph of the equation, that crossed the line more than once, it was not a valid 'something-or-other'.
An example of an invalid equation would be: y = sqrt(x)
Does anyone know what the 'something-or-other' is? And if there is a term for these equations, what is it?
My apologies if this was just a figment of my imagination.
Regards,
Chris
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