Short Answer: y = 40 Remark Bisect means cut's in half. So that means that the two angles are each 1/2 of the whole angle and are equal.
Step One Set up the equation y + 30 = 3y - 50 Subtract y from both sides. 30 = 3y - y - 50 30 = 2y - 50 Add 50 to both sides. 30 + 50 = 2y 80 = 2y Divide by 2 80/2 = y y = 40
check y + 30 = 3y - 50 40 + 30 = 3(40) - 50 70 = 120 - 50 70 = 70 and it checks.
