Tentukan nilai 4x -3y +2z dari sistem persamaan linear betikut 3x+2y+4z=11 2x+z=3 X-y=-1

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Kelas 10 Matematika
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x - y = -1
y = x + 1

2x + z = 3
z = -2x + 3

3x + 2y + 4z = 11
3x + 2 (x + 1) - 2x + 3 = 11
3x + 2x + 2 - 2x + 3 = 11
3x = 11 - 5
x = 6/3
x = 2

y = x + 1
y = 2 + 1
y = 3

z = -2x + 3
z = -2 . 2 + 3
z = -4 + 3
z = -1

4x - 3y + 2z = 4 . 2 - 3 . 3 + 2 . (-1)
4x - 3y + 2z = 8 - 6 - 2
4x - 3y + 2z = 0