Question

Solve the system
2x-y=-1
-2x+z=1
Y-z=0

Answer 1

Unless you are required to solve it as a matrix/vector product, the simplest way is, from the 3rd, get y=z, substitute in the second and notice that the two equations are one and the same. You have
`\infty^1` solutions, given by the vector
`[(t-1)/(2);t;t ]`