Answer:
15 feets
Step-by-step explanation:
Perimeter of a rectangle = 2(l + w)
l = Length ; w = width
Perimeter, p = 48
Length of all sides
p = 2(l + w)
48 = 2(l + 9)
48 = 2l + 18
48 - 18 = 2l
30 = 2l
l = 30/2
l = 15
Length of the sides = 15 feets
Answer:

Step-by-step explanation:
When solving for 1 variable, set the other to 0 and solve.

Answer:
The answer is D) (-1, -1)
Step-by-step explanation:
In order to find which answer is a solution, you have to put the ordered pair in for their given variables. If it produces a true statement, then it is a solution. In this case, D is the only one that produces a true statement.
2x + y > -4
2(-1) + (-1) > -4
-2 - 1 > -4
-3 > -4 (TRUE)