Conflict in General Maths HSC paper 2018!?! (1 Viewer)

[unadultarated]

so I used some trial and error to answer this question 27b 2018 General Maths
my answer was x = -2 and y = 3
though HSC answer was different, mine works would they accept that

 

[fan96]

Your answer doesn't work for the second equation:

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[unadultarated]

Your answer doesn't work for the second equation:

.

AHA. I think what I did is not apply the -- = + rule for the second one. Thanks