Verified Answer :

x-3y=16
-> x=16+3y
Put this x into the first equation
-> 4(16+3y) +y=25
-> 64+12y+y=25
-> 13y=25-64
-> y= -3
Put this y into first or second equation ( it's up to you :)
X-3y=16
-> x-3(-3)=16
-> x+9=16
-> x = 7
--->> (7;-3)
Good Luck

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