Answer:
x = 6
Step-by-step explanation:
20x + 11 + 9x - 5 = 180 ( linear pair)
29x + 6 = 180
29x = 180-6
29x = 174
hence angles are:
20(6) + 11 = 131
9(6) - 5 = 49
Solution,
20x+11+9x-5=180° (being linear pair)
or, 29x+6=180
or, 29x=180-6
or, 29x=174
or, x=174 ÷29
Therefore x=6°
