Notation for when x=?, y=?

Question

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

${x\choose y}={5\choose0}+t{0\choose1}$ 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
What is your real problem? What are you hoping to accomplish here? — J. M. ain't a mathematician, Nov 24 '11 at 22:51
If $\mathbf a(t)$ is the function that gives the acceleration at time $t$... then $\mathbf a(0)$ suffices, no? — J. M. ain't a mathematician, Nov 24 '11 at 23:02
@J.M. But I then went on to do the say when the velocity was 0; sorry I didn't explain that — Will03uk, Nov 24 '11 at 23:29
In short, you haven't yet posted your *real* problem. Could you explain in much detail what you really want to do here, in the question body? — J. M. ain't a mathematician, Nov 24 '11 at 23:32

score 3 · Accepted Answer · answered Nov 24 '11 at 22:34

3

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

answered Nov 24 '11 at 22:34

Gerry Myerson

179,216

score 2 · Answer 2 · answered Nov 24 '11 at 22:28

2

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

Hope that helps,

answered Nov 24 '11 at 22:28

Patrick Da Silva

41,413

Notation for when x=?, y=?

2 Answers2