-3x1+x2+3x= 102x2-x3=-4

Question

-3x1+x2+3x= 10
2x2-x3=-4

Answer 1

1)-3×1+×2+3×=10
-3+2×+3×=10
-3+5×=10
5×=10+3
×=13
2)2×2-×3=-4
4-3×=4
-3×=0
×=0