Determine the numerical length of AB.
AB + BC = AC
5x-9 + x = 2x+7
4x= 16
x = 4
AB = 5x-9
= 5(4) - 9 = 11 units, Domenica......
AC = BC + AB
2x + 7 = x + 5x - 9 solve for x
AB = 5x - 9 = ?
+37159 
