## Elementary Geometry for College Students (7th Edition)

x=9$^{\circ}$
Angles 2 and 6 are corresponding angles so they are congruent. m$\angle$2=m$\angle$6 x$^{2}$-9=x(x-1) x$^{2}$-9=x$^{2}$-x -9=-x x=9