x+y=13
x-y=7
x= 13-y
x-y= 7
13-y-y= 7
-2y= 7-13
y= -6/-2
y= 3
x= 13-3
x= 10
salu2.
suerte... :)
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x+y=13
x-y=7
x= 13-y
x-y= 7
13-y-y= 7
-2y= 7-13
y= -6/-2
y= 3
x= 13-y
x= 13-3
x= 10
salu2.
suerte... :)