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ax + by = - 4
cx + ay = 22
Ditanya : Nilai b - 4c = ?
penyelesaian :
Hp (4,2) ----> 4a + 2b = -4 | ×1-----> 4a + 2b = - 4
2a + 4c = 22 | × 2----> 4a + 8c = 44
------------------- -
2b - 8c = -48
2(b - 4c) = - 48
b - 4c = -48/2
b - 4c = -24
jawabanya B