Ray HK is an angle bisector, which means that it cuts the angle exactly in half. So half of GHI is 60. If GHK is 3x + 48, and that is half of angle GHI. then
You would select the points with the x-values -3 and 2 and use the slope formula: (-3, -36) and (2,4) ← slope formula x1 = -3 y1 = -36 and x2 = 2 y2 = 4