this problem is taken from dr chung sat math book. im supposed to find the slope of the line. i thought perhaps i could subtract the two x values to find the distance of 15. i just cant figure out how to get the height of the triangle.

let me back up, i want to create a triangle and let the hypotenuse be the slope of the line, which i could find using Pythagorean theorem. want to connect the centers of the circles to form a triangle and then solve...any thoughts on how i could find the height? and solve the problem?