You are lucky !


Because in the second equation the unknown "y" is just expressed via "x".


So, all you need to do is to replace "y" in the first equation by (-3x).

Then you get the single equation for one unknown y:

x - 4*(-3x) = -65,

x + 12x = - 65  ====>  13x = -65  ====>  x =  = -5.


Last step is to find y.  For it, substitute x= -5 into your second original equation to get y = -3*(-5) = 15.


Answer.  x = -5,  y = 15.