Answer:
18
Explanation:
You want the value of x in the diagram showing the linear pair of angles (6x+3)° and 69°.
Linear pair
Angles that form a linear pair are supplementary. That tells us ...
(6x +3)° +69° = 180°
6x +72 = 180 . . . . . . . . divide by °, simplify
6x = 108 . . . . . . . . . . subtract 72
x = 18 . . . . . . . . . . . divide by 6
The value of x is 18.
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