Help me please to resolve this equation.

Hello Every one:
I have the following equation
f(t) = X/(1-e^(-t/Y))
where X and Y are unknown, and e^z stand for exponential of z (e power
z).
I know two points of this function. Lets says f(t1) = s1, and f(t2) =
s2; where t1 and t2 are not zeros value.

So we got two equations:
s1 = X/(1-e^(-t1/Y))
and
s2 = X/(1-e^(-t2/Y))

Two equations and two unknowns, we should be able to resolve these
equations analytically, but I don't know how....
I should be fairly simple, but I am lost.
Thanks for your help.
Jeremy

.

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