Sketch the circles y^2+x^2=1 and y^2+(x-3)^2=4. There is a line with positive slope thaqt is tangent to both circles. Determine the points at which this tangent line touches each circle.

If you could help it would be greatly appreciated. I'm taking University calculus with only a pre-calculus background, and it's not the easiest thing in the world, let me tell you!

Thanks in advance.