Graph the lines of the system.
x + y = 8
x - y = 4

Nine more than four times a number is the same as one less than twice the number. find the number?

Which function has the domain x> -11

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?