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2x+2y=14
metodo sustitucion:
3x-y=1
3x=1+y
x=1+y/3 --- (1)
sustituir : 2x+2y=14
2(1+y/3 )+2y=14
2+2y+6y=42
2+8y=42
8y=42-2
8y=40
y=40/8
y=5 --- rpta
por lo tanto : en (1) ------- x=1+y/3
x=1+5/3
x=6/3
x=2 -- rpta
respuesta: x=2
y=5