x-4y - 02 = -3
x-3y + z = − 1
- 3x - 6 + 7z = 1
a
b.
5 -4
-3 -6
5
1
-3
-3 1
7
?
a
-4 -6
-3 -1
1-6
C
Mark this and return
3
d.
5 -4
0
ㅇ
5
-4
-6
-3
ㅇ
6.
1
0 0
-3
1
79~