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- (x+ 2y - 3 ) = -x - 2y + 3
b)
8 - (y - 3x +4) = 8 - y + 3x - 4 = 4 - y + 3x
c )
6y - (9x - 2y - 1 ) = 6y - 9x + 2y + 1 = 8y - 9x + 1
d)
1 + (-2x - 2y - 2 ) = 1 - 2x - 2y - 2 = -1 - 2(x + y)
e)
x+y + (-x + 2y - 1 ) = x + y - x + 2y - 1 = 3y - 1
f)
-x - 3y - (-x-3y ) = -x - 3y + x + 3y = 0