Someone please help me with this

Given :-

To Find :-

Solution :-

As we know that angles opposite to equal angles are equal . So ultimately all the angles inside the triangle would be equal to each other . Thus the triangle is a equilateral and each angle in a equilateral triangle is 60° . So ,

9x - 3° = 60°

9x = 60° +3°

9x = 63°

x = 63°/9

x = 7°

Hence the required answer is 7° .

b.an increase in a causes b to decrease