Question

X-2y+z=7
2x+3y-z=7
x+y+z=4
dengan metode eliminasi

Answer 1

Persamaan ( i )
x - 2y + z= 7
2x + 3y - z= 7
_____________ -
3x + y = 14

persamaan (ii)
2x + 3y - z = 7
x + y + z = 4
_____________ +
3x + 4y = 11

persamaan ( i ) dan ( ii )
3x + y = 14
3x + 4y= 11
___________ _
-3y = 3
y = -1

3x + y = 14
x = 5

x + y + z = 4
z = 0