Explicación paso a paso:
x+y=4
5x-6y=9
_______
x=4-y
x=(9+6y)/5
IGUALAR
4-y= (9+6y)/5
5(4-y)=9+6y
20-5y=9+6y
-5y-6y=9-20
-11y= -11
y= -11/-11
y=1
PARA X:
x=4-1
x=3
COMPROBACIÓN
3+1=4
4=4
5(3)-6(1)=9
15-6=9
9=9
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Explicación paso a paso:
x+y=4
5x-6y=9
_______
x=4-y
x=(9+6y)/5
IGUALAR
4-y= (9+6y)/5
5(4-y)=9+6y
20-5y=9+6y
-5y-6y=9-20
-11y= -11
y= -11/-11
y=1
PARA X:
x=4-y
x=4-1
x=3
COMPROBACIÓN
x+y=4
3+1=4
4=4
5x-6y=9
5(3)-6(1)=9
15-6=9
9=9