说出下列不等式的变形是根据不等式的哪一条性质:
(1)由x>-3,得x>-6;___________________________;
(2)由3+x≤5,得x≤2;______________________________;
(3)由-2x<6,得x>-3;____________________________;
(4)由3x≥2x-4,得x≥-4.___________________________;
说出下列不等式的变形是根据不等式的哪一条性质:
(1)由x>-3,得x>-6;___________________________;
(2)由3+x≤5,得x≤2;______________________________;
(3)由-2x<6,得x>-3;____________________________;
(4)由3x≥2x-4,得x≥-4.___________________________;