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Metodo de sustitucion.
2x - y = 15 (Ecua 1)
x = 2y (Ecua 2) Sustituyes este valor en (1)
2(2y) - y = 15
4y - y = 15
3y = 15
y = 15/3
y = 5 Reemplazas este valor en (2)
x = 2y
x = 2 * 5
x = 10
Solucion.
(10 , 5)