sorry, y=(1/3)^x = to y= 3^-1... How do you derive to -1? as the exponant and not a positive 1?

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Go back and watch the video clip again. The teacher said that y = (1/3)^x is the same as y = 3^(-x) NOT 3^(-1). The graph of y = 3^(-x) is a mirror-like image of y = (1/3)^x about the y-axis.