Penjelasan dengan langkah-langkah:

3x + 4y -z = 6

-z = 6 -3x -4y

z = -6 +3x +4y = pers 4

-2x + 9y + z = 9

-2x + 9y -6 + 3x + 4y = 9

x + 13y -6 = 9

x + 13y = 9+6

x = 15 -13y = pers 5

z = -6 + 3x + 4y

z = -6 + 3(15-13y) +4y

z = -6 + 45 -39y + 4y

z = 39 -35y = pers 6

-4x + 6y + 3x = 4

-4(15 -13y) + 6y + 3(15 -13y) = 4

-(15 -13y) + 6y = 4

-15 + 13y + 6y = 4

19y = 4+15

y = 19/19

y = 1

x = 15 -13y

x = 15 -13(1)

x = 15-13

x = 2

z = 39 -35y

z = 39 -35(1)

z = 39 -35

z = 4

Nilai

X = 2

Y = 1

Z = 4

Bukti

3x + 4y -z = 6

3(2) + 4(1) -4 = 6

6 + 4 -4 = 6

6 = 6

-4x + 6y + 3x = 4

-4(2) + 6(1) + 3(2) = 4

-8 + 6 + 6 = 4

4 = 4

-2x + 9y + z = 9

-2(2) + 9(1) + 4 = 9

-4 + 9 + 4 = 9

9 = 9

Jawaban

X + Y + X

2 + 1 + 2 = 5

Semoga membantu, salam

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~Stingray