Question

What is AB please help

Answer 1

AB = 3x and AC = 5x+21

AB + AB = AC =

3x + 3x = 5x + 21 = 6x = 5x + 21

-5x -5x

x = 21

Now, let's plug in 21 for x in AB

AB = 3x = 3(21) = 63