Question

100x +99y=501;99x+101y=499 find simultaneous eqn

Answer 1

100x +99y=501........eq1

99x + 101y= 499

=> (100-1)x + (99+2)y = 499

=> 100x - x + 99y + 2y = 499

=> (100x+99y) - (x -2y) = 499

from eq1

=> 501 - (x -2y) = 499

=> x-2y= 501-499

=>x-2y = 2