Answer:
B.
Step-by-step explanation:
Since she had 22 dollars but only put in 2 $5 bills, you would subtract 22 by 10, which means she already had 12 dollars in her piggy bank from before. The $12 is also the constant now. However many $5 bills she puts in her piggy bank has to be multiplied by 5 because that is the value of the bill.
