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1/5(x+y)=25 -----> x/5+y/5=25 -------->x+y=5-------->x=5-y
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(por metodo de sustitucion)
x-y=19
5-y-y=19
5-2y=19
-2y=19-5
-2y=14
y=14/-2
y=-7
x=5-y
x=5-(-7)
x=5+7
x=12
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comprobacion
x-y=19
12-(-7)=19
12+7=19
19=19
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