Let s represent the side length and b represent the base length.

2s + b = 25 (the perimeter is 25)

s = 2b (sides are twice as long as the base)

2(2b) + b = 25 (substituting for s)

5b = 25 (collect terms)

b = 5 (divide both sides by 5)

s = 2(5) = 10

The length of each side is 10, the length of the base is 5.

2s + b = 25 (the perimeter is 25)

s = 2b (sides are twice as long as the base)

2(2b) + b = 25 (substituting for s)

5b = 25 (collect terms)

b = 5 (divide both sides by 5)

s = 2(5) = 10

The length of each side is 10, the length of the base is 5.