- We know, when two lines intersect each other, then the vertically opposite angles are equal.
- Therefore,
[tex]x + 8 = 3x - 42 \: \: (vertically \: \: \: \: opposite \: \: \: \: angles) \\ = > 8 + 42 = 3x - x \\ = > 50 = 2x \\ = > x = \frac{50}{2} \\ = > x = 25[/tex]
