Question

Tentukan hp dari:
1) x + y + z = 3
x - y + z = 1
2x + y - 3z = 10

pakai eliminasi atau subtitusi

Answer 1

Verified answer

Jawab

x + y + z = 3
x - y + z = 1 | (-)
2y = 2
y = 1

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

2x +y - 3z = 10
2x + 1 - 3z = 10
2x - 3z = 9

x + z = 2 |kali 2
2x - 3z = 9

2x + 2z = 4
2x - 3z = 9 |(-)
5z = -5
z = -1

x + y + z = 3
x+ 1 - 1  = 3
x = 3

(x,y,z) = (3, 1, -1)