Question

solve the system
x1+X2 -x3 +x4 =5
-3x1 +x2 =5x4=2
2x1 + 1/2 x2 -x3= 2

Answer 1

are you talking about x^2 or 2x on the first line?

Answer 2

augmented matrix

Answer 3

write it in augmented matrix form and then use the Gaussian method to get into echelon form

Answer 4

after that use Guass Jordan (row reduced echleon form)