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3X = 7+ 4Y
X=
REEMPLAZAMOS ENLA SEGUNDA ECUACIÓN
5X+8Y=105
5 ( + 8Y =-105
35+20Y+24Y=-315
35+44Y=-315
44Y=-315-35
44Y=-350
Y= -175/22
AHORA HALLAMOS X
5X+8Y= -105
5X+8(-175/22)=-105
110X=-2310 +1400
X= -91/11
COMPROBAMOS
3X-4Y=7
3(-91/11) - 4(-175/22) =7
-273/11 + 350/11=7
77/11=7
7=7
(X;Y) = (3(-7))-4(-5)=7
-21+20=7
-1=7(no corresponde)