So if we somehow know this, we can find that. But an even better tactic would be to get rid of this. So notice we have a single equation and two unknowns. So mathematically we can't solve this. But if we come up with a system of equations, two equations and two unknowns, we could somehow manipulate the two equations, get rid of that C, and solve for our unknown. And in fact, that's exactly what we're going to do.