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Is there notation for what is essentially when, for the situation, for example:

In the situation when x is 2, y is 21t (edited)

Sorry for being brief; if it lacks clarity, please leave a comment and I will amend it

Edit:

It's to keep my math notes tidy when I'm asked to write the acceleration when time is 0; I have to write this as words though I feel it's sloppy and I'm wondering if there's notation for this situation

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${x\choose y}={5\choose0}+t{0\choose1}$ for $t\in\mathbb{R}$?? Other than that I have no idea what you are on about. –  Jp McCarthy Nov 24 '11 at 22:29
    
@JpMcCarthy Sorry, it's hard to explain; in the situation when x = 7, y = 21t (just another example; I hope it's clearer) –  Will03uk Nov 24 '11 at 22:40
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What is your real problem? What are you hoping to accomplish here? –  J. M. Nov 24 '11 at 22:51
    
Edited my question –  Will03uk Nov 24 '11 at 22:56
    
If $\mathbf a(t)$ is the function that gives the acceleration at time $t$... then $\mathbf a(0)$ suffices, no? –  J. M. Nov 24 '11 at 23:02
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2 Answers

up vote 3 down vote accepted

$$y(x)|_{x=5}=21t$$ should do.

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$(x,y) = (5,21t)$?

Hope that helps,

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