Respuesta :

Kweice

Answer:

B. x = 20

Step-by-step explanation:

angles on a straight line are supplementary

therefore, 6x+9 + 2x+11 = 180

so, 8x+20=180

8x = 160

x = 20

Bestflashcardbuilder

Answer:

B

Step-by-step explanation:

If you substitute the x values with 20 then the angles will add up to 180 on both sides. These angles are supplementary which means that they are suppose to add up to 180 degrees.