??? Now try a few on your own. Problem: Emilio is working on a project involving the use of metal rods. He knows that one rod must be 20 cm longer than the other. He also knows that the combined length of the rods is 42 cm. Let y the length of the other rod. Which two equations will help Emilio solve this problem? Click on the correct answer. x = 20-y y = 42 + x y = 42 + x y + 20 = x x+y=20 y=42-x x+y=42 x = 20+ y