Question

If AB is parallel to DC, find the value of x

Answer 1

I hope U understand

Answer 2

Draw OP || AB || CD.

From Basic Proportionality Theorem,

$\frac{co}{ao} = \frac{cp}{pb}$
And
$\frac{bo}{do} = \frac{bp}{cp}$

From the above two equations,

$\frac{ao}{co} = \frac{bo}{do} \\ \\ \frac{3x - 19}{x - 5} = \frac{x - 3}{3} \\ \\ x = 8 \\ x = 9$