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4x-5x = 4+5
x = 19
(A+B)x = 0x
A+B = 0
A = -B ..........[1]
-A +3B = 20 ........[2]
substitusi A=-B ke [2] didapat
-(-B)+3B = 20
B+3B = 20
4B = 20
B = 5
A= -B
A = -5
jadi,
jawaban opsi 2
kemungkinan jawabannya yang opsi 2.
semoga membantu