What Two statements express 9-a?

Select all the expressions that will include a remainder.

X+y=-4 x-y=2 use elimination with adding and subtraction

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle