Question

Tolong bantu jawab no 4 pake cara eliminasi

Answer 1

4.)
2x+3y+3y=4
2x-6y+9z=5
4x+3z=4

2x+3y+3y=4 }×(-6)
2x-6y+9z=5 }×(3)

-12x-18y-18z= -24
6x-18y+27z=15
_____________-
-18x-45z= -39
; -6x-15z= -13

-6x-15z= -13 }×4
4x+3z=4 }×(-6)

-24x-60z= -52
-24x-18z= -24
__________-
42z=28
z=28/42=2/3

4x+3z=4
4x=4-(3×2/3)
4x=4-(2)
x=2/4=1/2

2x+3y+3z=4
(2×1/2)+3y+(3×2/3)=4
3y=4-1-2
3y=1
y=1/3

1/2;1/3;2/3 (A)