And this slope looks larger than one. It looks like two, but since we're really just eyeballing it, let's see if we can find something that more clearly, where this more clearly falls apart. So let's look at the situation when, let's look at the situation when they both equal negative one. So x equals negative one and y is equal to negative one. Well in that case, dy dx should still be equal to one because you have negative one over one. Do we see that over here? So when x is equal to negative one, y is equal to negative one, our derivative here looks negative.