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To find the value of the function y = 1/8x - 13 when x = -4, we substitute x = -4 into the equation:
y = 1/8(-4) - 13
y = -1/2 - 13
y = -13.5.
Therefore, the value of the function y = 1/8x - 13 when x = -4 is -13.5.