Write the augmented matrix:


1*R1+2*R2->R2



-5*R1+2*R3->R3



*R2->R2
*R3->R3



 3*R2+1*R1->R1
-1*R2+1*R3->R3



*R1->R1



Write as a system of equations:



Simplify



Solve only for the first two variables, since there are
only two equations:



Let z be arbitrary variable  and let w be arbitrary variable 

 

or

(x, y, z, w) = (,-5+a+3b,a,b)

Edwin