Whether this is a segment or an angle, we will figure it out the same way. If IJ bisects GH at point J, then by the definition of "bisector" the segment or angle GJ or GJI respectively, is equal to HJ or HJI, respectively. Let's just work with segments cuz they're easier to write. That means GJ = HJ. If GJ is 3y-1 and HJ is 2y+7 and they are equal to each other, then 3y-1 = 2y+7. Solve for y. y = 8. Since both segments making up GH measure 8 units, then GH measures 16 units.
