Please answer the following with "1" for true and "-1" for false. (a) If G(x) = 4x and H(y) = y, then x and y are perfect substitutes. (b) If G(x) = 4x0.9 and H(y) = 4y0.9, then x and y are perfect...

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Extracted text: Please answer the following with "1" for true and "-1" for false. (a) If G(x) = 4x and H(y) = y, then x and y are perfect substitutes. (b) If G(x) = 4x0.9 and H(y) = 4y0.9, then x and y are perfect substitutes. (c) If G(x) = 4x0.9 and H(y) = 4y, then x and y are perfect substitutes. (d) If G(x) = x0.9 and Hy) = 4y0.9, then x and y are perfect substitutes.