Respuesta :

choixongdong
7x + 7 = 112
7x = 105
  x = 15

4y + 112 = 180
4y = 68
  y = 17

answer is A.
x = 15, y = 17
dalendrk
Look at the picture.

[tex]7x+7^o=112^o\ \ \ \ |-7^o\\\\7x=105^o\ \ \ \ |:7\\\\\boxed{x=15}\\\\(7x+7^o)+4y=180^o\\\\7\cdot15^o+7^o+4y=180^o\\\\105^o+7^o+4y=180^o\\\\112^o+4y=180^o\ \ \ \ |-112^o\\\\4y=68^o\ \ \ \ |:4\\\\\boxed{y=17}[/tex]
Ver imagen dalendrk

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