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 + 4y + 8z = -9 7x + 6y - z = -4
A. x - 2y - 7z = 17
-9x + 4y + 8z = -9
-16x - 2y + 9z = 5
B. x - 2y - 7z = 17
16x + 2y - 9z = 5
7x + 6y - z = -4
C. x - 2y - 7z = 17
-9x + 4y + 8z = -9
-2x + 10y + 7z = -13
D. x - 2y - 7z = 17
-9x + 4y + 8z = -9
16x + 2y - 9z = 5
Answer: D
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