To solve this problem, we will use the Basic Proportionality Theorem (BPT), also known as Thales's Theorem, and properties of similar triangles.
Step 1: Determine the ratio AB:BC.
We are given BC=83AC.
Since A,B,C are collinear, AC=AB+BC.
Substitute BC=83AC into the equation:
AC=AB+83AC
AC−83AC=AB
85AC=AB
So, ACAB=85.
From this, $