(1) x-4y=1
(2) 3y-x=7
=============
despejar x de (1)
x=1+4y
reemplazar x en (2) y despejar y
3y-(1+4y)=7
3y-1-4y=7
-y-1=7
*** y=-1-7=-8
evaluar y en x y despejar x
x=1+4(-8)
x=1-32
*** x=-31
verificar
-31-4(-8)=1
-31+32=1
1=1
3(-8)-(-31)=7
-24+31=7
7=7
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(1) x-4y=1
(2) 3y-x=7
=============
despejar x de (1)
x=1+4y
reemplazar x en (2) y despejar y
3y-(1+4y)=7
3y-1-4y=7
-y-1=7
*** y=-1-7=-8
evaluar y en x y despejar x
x=1+4(-8)
x=1-32
*** x=-31
verificar
-31-4(-8)=1
-31+32=1
1=1
3(-8)-(-31)=7
-24+31=7
7=7