What is the value of x? enter your answer in the box. x = a triangle with vertices labeled as a, b, and c. side b c is the base. a line segment is drawn from a to base b c that bisects angle b a c into two parts marked with single arcs. side a b is labeled as 9. side a c is labeled as 15. side b c is divided into two equal parts labeled as 2 x minus 1 and 3 x.