Crossover slope interaction ?s

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Is there a formula for predicting frequency response if the high and low pass crossover points and slopes are given?

For example- If I want to cross my highs at 18db/octave @ 100hz, what frequency do I need to cross my sub at with a 24db/octave slope in order to achieve flat response? I'm building sub and satellites for HT use and want to take some of the guess work out but don't have SPL meter yet.
 
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