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Kazeer [188]
3 years ago
6

replace the third equation by the sum of itself and -1 times the second equation x-2y-7z=17,-6x+4y+5z=-9,8x+7y=z=-4

Mathematics
1 answer:
VMariaS [17]3 years ago
6 0

Answer:

14x+3y-6z=5

Step-by-step explanation:

x-2y-7z=17 --- 1

-6x+4y+5z=-9 --- 2

8x+7y-z=-4 ---3

-1 times the second equation = -1(-6x+4y+5z=-9)

                                                 = 6x-4y-5z=9  --4

Now we are given that replace the third equation by the sum of itself and -1 times the second equation

So, New third equation = 8x+7y-z+6x-4y-5z=-4+9

                                       = 14x+3y-6z=5

Hence the new third equation is 14x+3y-6z=5

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