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Question
From the sum of 3x - y + 11 and - y - 11, subtract 3x - y - 11.
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Solution
(3x - y + 11) + (- y - 11)
= 3x - y + 11 - y - 11
= 3x - y - y + 11 - 11
= 3x - 2y
(3x - 2y) - (3x - y - 11)
= 3x - 2y - 3x + y + 11
= 3x - 3x - 2y + y + 11
= -y + 11
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