Circle P is tangent to the x-axis and the y-axis. If the coordinates of the center are (r, r), find the slope of the line through the origin and the center.
The origin equals (0, 0) and the center of the circle equal (r, r). We can use the slope formula: y_2 - y_1/x_2 - x_1 Fill in: 0 - r/0 - r r/r 1 The answer to this problem is 1.