50 = 98.19ln(x) - 540.53 how to calculate X?

Question

Im trying to measure IC50 in a log graph. the equation is

the y = 50, so how to calculate X?

Answer 1

You have the equation

50=98.19ln(x)-540.53

add 540.53 to both sides

590.53=98.19ln(x)

divide both sides by 98.19

6.01416=ln(x)

Now solve the logarithmic equation

e^(6.01416)=x

for an exact value, enter this into your graphing calculator. Realize 6.01416 is a rounded value.