She bought 2 pies that had 8 slices each for a total of 2*8 = <<2*8=16>>16 slices
Rebecca ate 2 of the 16 slices leaving 16-2 =<<16-2=14>>14 slices
Her family and friends at 50% of the pie so they ate 14*.50 = <<14*.50=7>>7 slices
There were 14 slices and her family and friends ate 7 slices so that leaves 14-7 = <<14-7=7>>7 slices
Sunday night Rebecca and her husband each had a slice from the remaining slices so that leaves 7-2 = <<7-2=5>>5 slices
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