Combined with the wave pattern of satellites orbit and earth's rotation so that satellite can cover more area on the earth to get more information.
You can launch a satellite in a westerly direction. But why you want to waste more energy? Because the earth's self rotation, the satellite have the same initial velocity as earth, so if it launch from west to east. You can save a lot of energy. Just like if you jumping from a car in the same direction as car, you will gain more energy!
Now, the server did not allow you to upload picture. But you can provide a URL of your picture (this should work).