Solve the system of equations -3x+7y=-18 and 4x-4y=8 by combining the equations​

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

Through non-collinear points there is exactly one plane.

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. solve this quadratic equation using the quadratic formula. 2x2 - 2x=1 need asap