Jacob was given a gift card for a coffee shop. Each morning, Jacob uses the card to buy one cup of coffee. Let A represent the amount money remaining on the card after
buying x cups of coffee. The table below has select values showing the linear
relationship between x and A. Determine how many cups of coffee Jacob had
purchased so far when he had $21 remaining on the card.
X
2
4
8
A
24
18
6