Question

Tentukan x , y , dan z dari sistem persamaan x + y + z =-3
x - y =7
2x+2y-z=6

Answer 1

x+y+z = -3
2x+2y - z = 6
____________+
3x + 3y= 3
=> x+y =1

x-y =7
x+y =1
______+
2x = 8
x = 4

=>x-y =7
4-y =7
y=-3

x+y+z = -3
4 + (-3) + z = -3
z = -4

=
x = 4
y = -3
z = -4