Respuesta :
Answer:
x=-27, y=-15
Step-by-step explanation:
In the attached file

y = 12 + x
x - 2(12 + x) = 3
x -24 -2x = 3
-x = 27
x = -27
y = -15
x - 2(12 + x) = 3
x -24 -2x = 3
-x = 27
x = -27
y = -15