On the basis of theromochemical equation...

On the basis of theromochemical equations (1), (2) and (3), find out which of the algebraic relationships given in options (a) to (d) is correct
(1) C (graphite) `+ O_(2) (g) rarr CO_(2) (g) , Delta_(r) H = x kJ mol^(-1)`
(2) C (graphite) `+ (1)/(2) O_(2) (g) rarr CO (g) , Delta_(r) H = y kJ mol^(-1)`
(3) `CO (g) + (1)/(2) O_(2) (g) rarr CO_(2) (g) , Delta_(r) H = z kJ mol^(-1)`

` x = y - z`

`z = x + y`

`x = y + z`

`y = 2z - x`

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