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4x - y = 4 ec. 2
de la ec. 1:
y = 2-3x ec. 3
Sustituyendo valores de la ec. 3 en la ec. 2:
4x - (2-3x) = 4
4x-2+3x = 4
4x+3x = 4+2
7x = 6
x = 6/7
de la ec. 3:
y = 2-3x
y = 2-3*6/7
y = 2 - 18/7
como 2 = 14/7
y= 14/7 -18/7
y = -4/7
Saludos...