Question

X - y = 1
x + y + z = 4
2x + 2y - z = 5

Nilai dari x. y. x adalah...

Answer 1

X + y + z = 4
2x + 2y - z = 5
Ditambah
3x + 3y = 9
Disederhanain :3
x + y = 3

x - y = 1
x + y = 3
Ditambah
2x = 4
x = 4/2 = 2

Subtitusi
x + y = 3
2 + y = 3
y = 3 - 2 = 1

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

x.y.x = 2.1.2=4