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2.(1)-3y = -1
-3y = -3
y = 1
y=b=1
2x - 3y = -1
Masukkan nilai x dan y ke persamaan
2(1) - 3(b) = -1
2 - 3b = -1
-3b = -1 - 2
-3b = -3
b = -3/(-3)
= 1
Maka b = 1