What must be subtracted from 3x + 8 xy + 9y to get 7x - xy + 8xy
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Answer:
a = -4x + xy
Step-by-step explanation:
Let the number be a.
==: 3x + 8xy + 9y - a = 7x - xy + 8xy
==: 3x + 8xy + 9y - (7x - xy + 8xy) = a
==: a = 3x + 8xy + 9y - 7x + xy - 8xy
==: a = -4x + xy
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