Respuesta :

reinhard10158

Step-by-step explanation:

well, because the 2 lines are intersecting each other at a right angle (90°), the complete angle CBD is 90°.

that means the sum of the sub-angles must be 90° :

DBE + CBE = 90

2x - 1 + 5x - 42 = 90

7x = 133

x = 19