What is 2x plus 21 divided by 2 equals x plus 7?

How do you solving the solution of each system using elimination?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Fill in the blank 1. a rhombus is a rectangle a) always b) sometimes c) never 2. a square is a quadrilateral a) always b) sometimes c) never 3. a trapezoid is a kite a) always b) sometimes c) never 4. a quadrilateral is a kite a) always b) sometimes c) never 5. a square is a rhombus a) always b) sometimes c) never 6. a parallelogram is a rectangle a) always b) sometimes c) never