[SOLVED] solving (another) system

**satis** · March 6th 2010, 04:37 PM

Would someone be so kind as to show me how I would go about solving this?

$y-e^{-x} = 1$
$y-lnx = 3$

**Prove It** · March 6th 2010, 08:38 PM

Originally Posted by satis

Would someone be so kind as to show me how I would go about solving this?

$y-e^{-x} = 1$
$y-lnx = 3$

By subtracting one equation from the other, you can eliminate the $y$ .

So $e^{-x} - \ln{x} = 3 - 1$

$e^{-x} - \ln{x} = 2$ .

I suspect you will need to use technology to solve for $x$ in this case.

**HallsofIvy** · March 7th 2010, 03:09 AM

I've always wondered about the phrase "use technology". A pencil and paper are "technology"!

**Prove It** · March 7th 2010, 03:19 AM

Originally Posted by HallsofIvy

I've always wondered about the phrase "use technology". A pencil and paper are "technology"!

Maybe I should say "use a computer that has a built-in numerical method that could be done by pencil and paper but because of time constraints, most people just reach for the computer..."

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