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Materi SLPTVx + 2y = -3 ➙ x = -3 - 2y ... (i)
Subtitusi persamaan (i) ke x + y + 2z = 5
➙ -3 - 2y + y + 2z = 5
➙ -y + 2z = 8 ... (ii)
➙ y + 2z = 4 ... (iii)
–––––––––––– (–)
-2y = 4
y = -2
Subtitusi y = -2 ke persmaan (ii)
-(-2) + 2z = 8
2z = 6
z = 3
Subtitusi y = -2 ke persamaan (i)
x = -3 - 2(-2)
x = -3 + 4
x = 1
Nilai 3(x + z)
= 3(1 + 3)
= 3(4)
= 12