Respuesta :

choixongdong
5x - 100 + x - 20 = 180 (sum of supplementary angles is equal 180)
6x - 120  = 180
6x = 300
  x = 50

x - 20 = 50 - 20 = 30

so
3y = 30 (vertical angles are equal)
 y = 10

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