Can someone please help

What term makes it inconsistent y=2x - 4 ?

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer