If m∠1 = (4x + 2) and m∠3 = (5x – 15), what is the value of x? Two intersecting lines form four angles, 1, 2, 3, and 4. Angles 1 and 2 are adjacent angles and angles 1 and 3 are vertical angles. A. 14 B. 15 C. 16 D. 17