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1. 6a + 4 dari 4a - 7
Jawab : 4a - 7 - (6a + 4) = 4a - 7 - 6a - 4
= 4a - 6a - 7 - 4
= -2a - 11
2. 6x + 5y - 4 dari 3x - 2y - 8
Jawab : 3x - 2y - 8 - (6x + 5y - 4) = 3x - 2y - 8 - 6x - 5y + 4
= 3x - 6x - 2y - 5y - 8 + 4
= -3x - 7y - 4
3. 4x - 4y + 5 dari 6x - 7y + 3
Jawab : 6x - 7y + 3 - (4x - 4y + 5) = 6x - 7y + 3 - 4x + 4y - 5
= 6x - 4x - 7y + 4y + 3 - 5
= 2x - 3y - 2
no 4 maksud'nya gimana?