What are the steps to solve these questions.

6. (15 points) Solve the system of equations: aI + by P CI + dy Your answer should be an expression for r, and an expression for y. Include brief description in words of your steps. = y =7. (10 points) Complete the square to find the vertex of the parabola I = ay' + by+ c Include brief description in words of your steps. I = y =