1 Answer

Kratenko · Answer 1 · 2022-06-25T08:21:45+0000

Answer:

"Add equations A and B to eliminate
. Add equations A and C to eliminate
".

Explanation:

Let be the following system of linear equations:

$4\cdot x + 4\cdot y + z = 24$ (1)

$2\cdot x - 4\cdot y +z = 0$ (2)

$5\cdot x - 4\cdot y - 5\cdot z = 12$ (3)

1) We eliminate
by adding (1) and (2):

$(4\cdot x + 2\cdot x) +(4\cdot y - 4\cdot y) + (z + z) = 24 + 0$

$6\cdot x +2\cdot z = 24$ (4)

2) We eliminate
by adding (1) and (3):

$(4\cdot x + 5\cdot x) +(4\cdot y - 4\cdot y) +(z -5\cdot z) = (24 + 12)$

$9\cdot x -4\cdot z = 36$ (5)

Hence, the correct answer is "Add equations A and B to eliminate
. Add equations A and C to eliminate
".

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