Question

find x,y,z of the system of linear equation x+y-3z=-6, -7y+7z=7, 3z = 9​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

3z = 9

z=9/3 = 3.......... z= 3 ............(1)

-7y+7z=7, put (1) in this

-7y +7(3) =7

-7y + 21 = 7

-7y = 7 - 21

-7y = -14

y =2 ...........(2)

x+y-3z=-6 ...........put (1) and (2) in this

x + 2 -3(3) = 6

x + 2 -9 = 6

x -7 = 6

x = 6 + 7

x = 13