Respuesta :

Heather

Answer: 12

Step-by-step explanation:

     A straight line has a measurement of 180° so these two angles added together will equal 180°.

     (10x - 20)° + (6x + 8)° = 180°

     10x° + 6x° + 8° - 20° = 180°

     16x° -12° = 180°

     16x° = 192°

     x = 12

Supplementary angles

  • 10x-20+6x+8=180
  • 16x-12=180
  • 16x=180+12
  • 16x=192
  • x=192/16
  • x=12