TatianaKaplan TatianaKaplan 10-02-2017 Mathematics contestada Simplify if x = 5 and y = 4. x + y = xy = 5xy = 2x + 3y - xy = Simplify if a = -2 , b = 3, and x = 4. abx = 3ab = 3a + 2b - 4x = x + 7ab =