Question

How do you solve `2x + 3y - z = 1`, `3x + y + 2z = 12`, and `x + 2y - 3z = -5`?

Answer 1

Have a look:

Explanation:

I would use Cramer's Rule:

Where the matrices `A_x,A_y and A_z` are obtained changing the columns corresponding to x, y and z.

Graphically: