How can I write an expression for the sum of two(unknown) numbers in terms of just x ?

Can I write:

x=1/y

or ....

x=1/X ?

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- Mar 25th 2008, 04:12 PMkbgemini16Math modeling question ???
How can I write an expression for the sum of two(unknown) numbers in terms of just x ?

Can I write:

x=1/y

or ....

x=1/X ? - Mar 25th 2008, 10:22 PMCaptainBlack
- Mar 26th 2008, 05:47 AMkbgemini16No Clue...
The directions are to create an expression that represents two unknown numbers for which I will use "x" & "y" to represent them. How can I write an expression for their sum in terms of just X

So since it's asking for an expression for the sum of the two unknown numbers I know the expressions that I need to create will have a "+" but I can't show the expression in terms of just "x"

I was thinking that:

f(x)=x+y

or...

f(x)=1/y

or...

f(x)=1/x

I don'rt know, I'm lost because I don't understand the part of the question that asks for the sum in terms of just "x" ....

(Worried)

- Mar 26th 2008, 07:05 AMCaptainBlack
- Mar 26th 2008, 07:12 AMkbgemini16
Yes "X" & "x" are the samething my error ...(Doh)

- Mar 26th 2008, 08:33 AMCaptainBlack
- Mar 26th 2008, 11:33 AMiknowone
Is it known how x and y are related? In other words can you express one of the unknowns in terms of the other (for example maybe y=x^2)? Then expressing the sum of the two unknowns in terms of just one unknown is a triviality.