5x+7y=31 , 3x-5y=21??​

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show