Answer:
Step-by-step explanation:
AB is equal to AC
so x + 7 = 2x - 1
then simplify
7 = x - 1
x = 8
plug it back into AB
8 + 7 = 15
so AB is 15
15
AB=AC
x + 7 = 2x - 1
8 = x
now you plug in 8 for x in the equation for line AB
(8) + 7 = 15
