The sum of two numbers, x and y, is 12. the difference of four times the larger number and two times the smaller number is 18. which system of equations should you use to find the two numbers? a x – y = 12 4x – 2y = 18 b x + y = 12 x – y = 18 c x + y = 12 2x – 4y = 18 d x + y = 12 4x – 2y = 18

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?