Put in all the 1 coefficients
Take out the variables and replace the column
of equal signs by a vertical line:
Do row operations
-1R1+R2->R2
(That means to multiply row 1 temporarily by -1
and add it to row 2, replace row 2 by that, then
restore row 1 as it was):
-2R1+R3->R3
-R1+R4->R4
-R2+R1->R1
R2+R3->R3
R3->R4
R4->R3
(That means to interchange row 3 and row 4)
-R3->R3
{That means to multiply row 3 by -1)
-3R3+R1->R1
R3+R2->R2
4R3+R4->R4
R4->R4
(That means to multiply row 4 by )
-4R4+R1->R1
R4+R2->R2
-R4+R3->R3
Place the variables and equal signs back in
Simplify:
Edwin
