We will have the following:
First, we solve both equations for y, that is:
&
From this we can see that they are parallel lines, that do not share any common points, so there is no solution for the system.
If you want the area of a square with given side, you have to square the length of the side.
So, if the side is , the area will be
About 7.5 miles if you divide 45/3 is 15 so divide 15/2 which is 7.5