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May 15th, 2008, 06:56 AM   #1
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need help to solve the problem

I wish to solve this euqtion to find LC 90 .
I need to figure out the value of concentration which would kill 90% of toxic material.

The value of a,b,c,d is known from regression .

Y%=Exp^(a*con+b)+Exp^(c*con+d)

I need to cut down the quation to find con value.

10%=Exp^(a*con+b)+Exp^(c*con+d) which should give me

con= ?

Could any body help me solve this equation.

Regards
Pac
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May 18th, 2008, 01:13 AM   #2
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Inspect the graph of e^(a*con + b) + e^(c*con + d).
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