Solve the following system of equations using matrices. 4x – 2y = -6 3x – 6y = -18 (40, 90) (3, 0) (0, 3) (-6, 18)

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.

(-14+3/2b) - (1+8/2b) = -5 -5/2b(-10+b) + (7b-5) = 8b-15(7/2b-3) - (8+6b) = -5/2b-11(5+2b) + (2b+3/2) = 4b+ 13/2