Answer:

Step-by-step explanation:
12x-3y=21
4x-y=7
I hope this helps
I BEILEVE that 1.29x7=9.03
so if you add 67.59 to 9.03 you'll get
*76.62*
Bruce spent $76.62 on dog food.
Id say its between a and c. your best bet would be a since you have to plug in 9 for y.