The value of expression mx - ny is 3 when x = 5 and y = 6 and its value is 8 when x = 6 and y = 5. Find the values of m and n.

Solve :

11(x - 5) + 10(y - 2) + 54 = 0

7(2x - 1) + 9(3y - 1) = 25

Solve using cross-multiplication :

0.4x - 1.5y = 6.5

0.3x + 0.2y = 0.9