Question

2x + y = 5
x + y + z = -2
2x + 2y + z = -2

tolong bantuan nya temann..

Answer 1

2x + y = 5 
x + y + z = -2 | kali 2
2x + 2y + z = -2

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

2x + y = 5 
2x+2y+2z=-4
------------------- -
-y-2z=9

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

-y-2(-2)=9
-y+4=9
-y=5
y=-5

x+(-5)+(-2)=-2
x=5