Question

Tentukan solusi dari sistem persamaan berikut!
2x + 3y = 8
x + 4z = -6
2y - z = 9

Answer 1

2x + 3y = 8....2x = 8-3y....x= (8-3y) /2
x + 4z = -6.....
2y - z = 9  .....z= 2y-9
Maka :
x + 4z= -6.......(8-3y)/2 + 4 (2y-9) =-6
4 - 3/2y + 8y -36= -6.....
4-36-3/2y+8y=-6

-3/2y+16/2y= -6+32
13/2y=26....  13y = 52....
y=4
z=-1
x=-2