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x+y = -1 (kali 4) --> 4x+4y = -4 (2)
kurangkan (1) dengan (2), didapat
3y = 9, jadi y = 3
substitusi y ke (2) didapat x= -4
x+y=-1 l ×4 l 4x+4y=-4 -
3y=9
y=3
subtitusikan: x+y=-1
x+3=-1
x =-1-3
x =-4
menurut saya jawaban ini tepat