## Geometry: Common Core (15th Edition)

Since Y is the midpoint, $XY\cong YZ$. $2b-1=26-4b$ add 4b to each side $2b-1+4b=26-4b+4b$ $6b-1=26$ add 1 to each side $6b-1+1=26+1$ $6b=27$ divide each side by 6 $6b\div6=27\div6$ $b=4.5$