Question

1 Solve the equations 3x+4y+5z=18,2x-y+8z=13
5x - 2y + 7z = 20 by matrix inversion method​

Answer 1

Answer:

First ELEVATION method for 1 and 2

3x+4y+5z = 18

2x-y +8z = 13

multiply -1 ×equation 1

multiply 4× equation 2

Now,

-3x-4y-5z = -18

8x-4y+32z = 52 change the sign for this equ (-) (+) (-) (-)

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-11x -37z = 70