8x+5y=9,3x+2y=4 by substitution method
https://www.teachoo.com/3157/684/Ex-3.4--15---Find-inverse--2--3-3-3-2-3-3--2-2----Chapter-3-NCERT/category/Ex-3.4/
ABCD Is a trapezium in which AB||DC and its diagonals intersect each other at O. Using basic proportionality theorem, prove that AO/BO = CO/DO