Remember please that Diagonals of a Rectangle are equal to each other:<span>
3y/5 = 3(y-4) So </span><span>3y = 15(y-4)
3y = 15y - 60
60 = 12y
y = 5 Diagonals are both 3 units With that you will be able to know which is the answer from your options</span>
