36. Solve the following system of equation by matrix method: x-y +2z = 7, 3x+4y-5z = -5, 2x-y + 3z =12.
Diagonals AC and BD of a trapezium ABCD with AB || DC intersect each other at thepoint O. Using a similarity criterion for two triangles, show that 𝑂𝐴/𝑂𝐶= 𝑂𝐵/𝑂𝐷.