Two angles forms a straight line. In this case, the given is 75°. Subtract 75° from 180° to get the other measure of the angle.
>> 180° - 75° = 105°
9x - 30 = 105
9x - 30 + (30)= 105 + (30)
9x = 135
9x/9 = 135/9
x = 135/9
x = 15
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Answer: B. 15
Two angles forms a straight line. In this case, the given is 75°. Subtract 75° from 180° to get the other measure of the angle.
>> 180° - 75° = 105°
9x - 30 = 105
9x - 30 + (30)= 105 + (30)
9x = 135
9x/9 = 135/9
x = 135/9
x = 15