I went to mathamadics.com it gave me all my answers to that type of question
1.for x it's 2x+5y=-1 you just do -5y on each side so you get 2x=-5y-1 then you divide it by 2 and it's x=-5/2-1/2
There are 24 hours in a day so it would be 21 x 24 which is
504 so your answer is The Turtle can walk 504 miles a day at a rate of 21m/hr.
