f(x) = 8x - 9 for x=-8
substitute -8 for x in equation:
f(x) = 8(-8) - 9 = -64 -9 = -73
f(x) = 8x - 9 for x=-8
substitute -8 for x in equation:
f(x) = 8(-8) - 9 = -64 -9 = -73
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