Anything you like. x = -4 imposes no restrictions on the value that y can take.
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13 ? 15
y=8 y = 2x y = 2(4) <-- substitute 4 for x y = 8 <-- this is your answer
18
y=|x|/4 The range is [0 , ∞ )
x = 3 y = 4 2x + y - 1 = (6) + (4) - 1 = 9