Your radius as a function of y is going to be equal to the square root of y plus 1. This essentially will give you one of these x values when you're sitting on this curve. So x as a function of y will give you one of these x values. And then from that, you add another 2. So plus 2. Another way of thinking about it, you get an x value here. And from that x value, you subtract out x is equal to negative 2.