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-3x₊4y =0
Quedaría asi:
x=7-16y/9
y=3x/4
Entonces:
9x₊16y=7
9x₊16(3x/4)=7
9x₊12x=7
21x=7
x=7/21
x=1/3
Ahora remplazamos en la ecuación:
y=3x/4
y=3(1/3)/4
y=(3/3)/4
y=1/4
Rpta: x=1/3, y=1/4