Question

5x-6z=-17
3x-4y+5z=-1
2x=-6

Answer 1

2x = -6
x = -3
..................................
5x - 6z = -17
5 (-3) - 6z = -17
-15 + 17 = 6z
2 = 6z
1/3 = z
.....................................
3x - 4y + 5z = -1
3 (-3) - 4y + 5 (1/3) = -1
-9 -4y + (5/3) = -1
-9 +1 + (5/3) = 4y
-8 + (5/3) = 4y
-19/3 = 4y
-19/ 12 = y