Question

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Answer 1

x° = 19°

Explanation:

`= > 123 \degree + 3x \degree = 180 \degree \\ \\ = > 3x\degree = 180\degree - 123\degree \\ \\ = > 3x\degree = 57\degree \\ \\ = > x\degree = ((57)/(3) )\degree \\ \\ = > x\degree = 19\degree`

Answer 2

As the angles are supplementary, their sum is 180

123 + 3x = 180

3x = 57

x = 19