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x+4y=-25
x= -25-4y
Sustituimos "x"
-10x-5y=5
-10(-25-4y)-5y=5
250+40y-5y=5
35y=5-250
35y=-245
Y=7
Reemplazamos:
x+4y=-25
x+4(7)=-25
x+28=-25
x= -25-28
x= -53
comprobamos :
x+4y=-25
-53+4(7)=-25
-53+28= -25
-25=-25