Which set of ordered pairs does not represent a function. ill put the picture up

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

Can you me find the missing length. i attached an image.

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.