3foot long sandwich for a party. she cuts the sandwich into pices, with each piece being 12 foot long how many pieces does she get

If the answer is 12 inches long the answer would be 3. She would have 3 sandwiches.

12 inches = 1 foot

3 assuming that you meant 12 inches long instead of each piece being 12 feet long. 
You would need to know that 1 foot= 12inches which means that every piece is really a foot long. 
So, 3 foot long sandwich÷ 1 foot per piece= 3 pieces

Y=-2x-6 is the answer