the length of the base of an isosceles triangle is x. the length of a leg is 2x-3. the perimeter of the triangle is 39. what is x

Answer 1

In an isosceles triangle, the two legs have the same length. So if one leg is 2x-3, the other leg is also 2x-3. The perimeter is the sum of the three sides of the triangle:

base + one leg + other leg = perimeter

x + 2x - 3 + 2x - 3 = 39

Solve for x.