The circumference of isosceles triangle is 10, the waist length is x, and the bottom edge length is y. find the value range of X

The circumference of isosceles triangle is 10, the waist length is x, and the bottom edge length is y. find the value range of X

According to the meaning of the title, y = 10-2x
According to the triangle trilateral relationship, we can know: X-X