Question

X,y dan z adalah penyelesaian sistem persamaan:
x+2y=-4
2x+z=5
y-3z=-6

Answer 1

X + 2y = -4
x = -4 - 2y

2x + z = 5
2( -4 - 2y) + z = 5
-8 - 4y + z = 5
-4y + z = 5 + 8
-4y + z = 13

y - 3z = -6 |x1| y - 3z = -6
-4y + z = 13 |x3| -12 y + 3z = 39
---------------------------- +
-11y = 33 , y= -3

x + 2y = -4
x - 6 = -4
x = -4 + 6
x = 2

y - 3z = -6
-3 - 3z = -6
-3z = -6 + 3
-3z = -3
z = 1