Respuesta :

fnej

Answer:

A) 7x - 1 + 3x - 9 = 180

Step-by-step explanation:

Since these angles are supplementary, they have to add up to 180

Only the first choice does that

leilaisawesome

Answer: (7x-1) + (3x-9) = 180

Step-by-step explanation:

Since the angles DBA and ABC lie on a horizontal line, they are supplementary angles, meaning that the sum of their angle measures is 180 degrees. Knowing this, you can set up the equation (7x-1) + (3x-9) = 180 in order to find the value of x.

I hope this helps!