Question
Simplify following:
[5 - 3x + 2y - (2x - y)] - (3x - 7y + 9)
[5 - 3x + 2y - (2x - y)] - (3x - 7y + 9)
✓
Answer
[5 - 3x + 2y - (2x- y)] - (3x - 7y + 9)
= [5 - 3x + 2y - 2x + y] - (3x - 7y + 9)
= [5 - 5x + 3y] - (3x - 7y + 9)
= 5 - 5x + 3y - 3x + 7y - 9
= 5 - 9 - 5x - 3x + 3y + 7y
= -4 - 8x +10y
= [5 - 3x + 2y - 2x + y] - (3x - 7y + 9)
= [5 - 5x + 3y] - (3x - 7y + 9)
= 5 - 5x + 3y - 3x + 7y - 9
= 5 - 9 - 5x - 3x + 3y + 7y
= -4 - 8x +10y
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