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jadi
2x-y-1=0
4x-y-5=0
--------------(+)
jadi y dicoret dan hasilnya
6x-6=0, -6 pindah kekanan
6x=6
x=1
masukkan dalam salah satu persamaan
2(1)-y-1=0
-y = 1-2
-y = -1
y = 1
kita udah dapat x = 1 dan y = 1
masukkan dalam persamaan a
a(1)-1-7=0
a-8=0
a = 8 (E)