If `[x-y2x+z2x-y3z+w]=[-1 5 0 13]` , find `x ,\ y ,\ z ,\ wdot`

Explanation

`x - y = -1 -------- i`

` 2x – y = 0 -------- ii`

` 2x+ z = 5 --------- iii`

` 3z + w =13 ------- iv`

i in equation ii ,

` x = -1 + y `

ii becomes,

`-2 + 2y –y = 0`
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