Tentukan nilai X dan Y, dengan cara eliminasi. X + 3y + 5z=16 2x+ 4y +7z = 12 X+ y + 9z= 20

x + 3y + 5z = 16
2x + 4y + 7z = 12
x + y + 9z = 20

1) x + 3y + 5z = 16 x2
2x + 4y + 7z = 12 x1

2x + 6y + 10z = 32
2x + 4y + 7z = 12
--------------------------------(-)
2y - 3z = 20

2) x + y + 9z = 20
x + 3y + 5z = 16
---------------------------------(-)
-2y + 4z = 4

3) 2y - 3z = 20
-2y + 4z = 4
------------------------------------(+)
z = 24
-2y + 4(24) = 4
-2y + 96 = 4
-2y = 4 - 96
-2y = -92
y = 46

x + 46 + 24 = 20
x = 20 - 46 -24
x = -50

kalau ada yg ga paham tanya ya dek :)