I'm new to linear programming and I found a basic example on simplex. It's about producing tablets and phones. the problem
The equations are the following:
$$1P-7x1-5x2+0s1+0s2=0$$ $$0P+4x1+3x2+1s1+0s2=240$$ $$0p+2x1+1x2+0s1+1s2=100$$ after making the equations and solving them they are saying to multiply the last row by 2 as final step. penultimate tableau, where the blue numbers stand for the solution after the ERO operation that is indicated in red
final solution where they multiplied the last row with 2
As far as I can follow I don't see why this would be usefull.