How do i write two equivalent expressions that represent a situation

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

How do i multiply two digit numbers

The table below lists recommended amounts of food to order for 10 party guests. how much of each food item should nathan and amanda order for a graduation party with 55 guests? use the table to answer. item amount fried chicken 16 pieces lasagna 7 pounds deli meats 1.8 pounds sliced cheese 1 and two fifths pounds bakery buns 1 dozen potato salad 2 pounds