Question

Solve the following system of equations using matrices.

4x – 2y = -6
3x – 6y = -18

(40, 90)

(3, 0)

(0, 3)

(-6, 18)

Answer 1

It is convenient to let a calculator do the math.
.. (x, y) = (0, 3) . . . . . your 3rd selection

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I prefer using the RREF function to put the augmented matrix into reduced row-echelon form. If the equations are dependent or inconsistent, using that method tells you so without giving a matrix inversion error.