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biasanya klo di pilhan ganda pasti ada yang kek gini misal nya
A. -3x+2y-7 = 0
B. -3x-2y -7 = 0
titiknya kan x=-1 y=2
jadi kita coba aja satu" dri pilihan nya
A. -3.-1 + 2.2 -7 =0
3 +4 -7 = 0
7 - 7 = 0 (bner brarti, krna hasil pengurangan hasil harus 0)
B. -3.-1 -2.2 -7 = 0
3 - 4 -7 =0
-1 -7 = 0 (salah, krna -1-7= -8 bukan 0)