A dog breeder is planning to buy more dog food. He makes a table showing how
many pounds of food he will have after shopping. The table is based on how much he
spends and how much food he already has. Which equation generates the table?

Money Spent (x) $0 $20 $40 $60

Pounds of Food (v) 4 12 20 28
O

x=y-4
y=8x-4
x = 8y +4
Oy=x+4