given: x - 4 = -y or, -y = x - 4 or, y = -(x - 4) or y = -x + 4 or y = 4 - x i.e. for x > 4, the equation x - 4 = -y is true.
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Question 3C: Four minus seven equals negative two.
(-3) - (-7) = (-3) + (+7) = (-3) + 7 = 4
-7 minus -4 is -3
-9 minus -4 is -5
x=-1 ^ how do you know?