Obtain an equivalent system by performing the stated elementary operation on the system. Replace the third equation by the sum of itself and -1 times the second equation. x - 2y - 7z = 17-9x + 8y + 6z = -9 5x + 3y - z = -4
A. x - 2y - 7z = 17
-9x + 8y + 6z = -9
-14x + 5y + 7z = 5
B. x - 2y - 7z = 17
-9x + 8y + 6z = -9
14x - 5y - 7z = 5
C. x - 2y - 7z = 17
14x - 5y - 7z = 5
5x + 3y - z = -4
D. x - 2y - 7z = 17
-9x + 8y + 6z = -9
-4x + 11y + 5z = -13
Answer: B
Mathematics
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