Well, you can imagine, you're given three variables with one equation up here, another two variables with another equation, we have five unknowns with two equations, there's no way we're going to be able to individually figure out what a a or a or b a or b or a or b or c a or b or c or a or b or c or x a or b or c or x or a or b or c or x or y a or b or c or x or y is, but maybe we can use what we saw in the last example to solve this. 