# Eliminate some variable from two equations

1. Sep 23, 2007

### danni7070

How can I eliminate T from these equations

(1) a = (X-T)/X
(2) a = 4T/Y

2. Sep 23, 2007

### HallsofIvy

Staff Emeritus
Here's a kind of obvious thought: solve the second equation for T (it's much easier to solve for t than the first). Replace the T in the first equation with that expression.

3. Sep 23, 2007

### danni7070

So it would be a = 4(X-aX)/Y ?

4. Sep 23, 2007

### tabchouri

If those are all free variables, you wont be able to solve the system as you have 3 variables and only 2 equations.

and yes, it would be so.

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