Solve - 3x + 2y + z = - 6

x + 3y + 2z = 5

4x + 4y + 3z = 13

(-6, 5, 13)

(0, - 3, 0)

(1, - 2, - 1)

(3, 4, - 5)

(3, 4, - 5)

You can solve these by plugging in to see which fits all 3 equations. You can also use elimination using two equations twice and getting 2, 2-variable equations which you can then solve for the first variable.