Simplified answer:
When you have a theory in maths or physics, you can usually prove that it is right by assuming that it it is wrong, thus that the opposite is true, then you start working on some equation using that assumption, until you inevitably stumble upon a oaradox. The paradox proves that the opposite of the initial theory is false, thus the theory is true.
Google something like proving that the root of 2 is irrational to see it done.
But if you mean the whole system…
Well… It just works. It replicates the real world. Imagine if you said that addition should be done before multiplication. You would end up with wring results compared to stuff in the real world.
I guess that is just a very simple answer, but someone might privide something more complex.
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