how do you substitute, then solve the resulting equation??
The rectangular playing area of a professional football field is 100 yards long. The perimeter of the playing area is 920 feet. The formula for the perimeter of a rectangle is p = 2L + 2W

Question

how do you substitute, then solve the resulting equation??
   The rectangular playing area of a professional football field is 100 yards long. The perimeter of the playing area is 920 feet. The formula for the perimeter of a rectangle is p = 2L + 2W

kropot72 · Answer

The question gives the value of L.
L = 100 yards. So substitute 100 in place of L in the equation for p and solve to find W.
Can you do that?