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5x = 10y
-2 = y
5x - 10y = 0 Despejas y
5x = 10y
5x/10 = y Simplificas
x/2 = y Para x = - 4
- 4/2 = y Simplificas sacas mitad
-2 = y
Respuesta.
y = - 2
Opcion b