The sum of two numbers is 12. The first number, x, is twice the second number, y. Which system of equations could be used to find the two numbers? A system of equations. x plus y equals 12. x equals 2 plus y. A system of equations. x plus y equals 12. x equals 2 y. A system of equations. x y equals 12. x equals 2 plus y. A system of equations. x y equals 12. x equals 2 y.

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?