Question

What must be subtracted from 3x + 8 xy + 9y to get 7x - xy + 8xy

Answer 1

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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