2w + 2l = 25
2 * 2 + 2l = 25
Simplfiy.
4 + 2l = 25
Subtract 4 from both sides.
2l = 21
Divide both sides by 2.
l = 10.5
Now that we have the value of l, we can find the area.
A = lw
A = 10.5 * 2
A = 21.
The length is 10.5cm.
The area of the rectangle is 21cm^2