5X+3Y+2Z=2.......(2)

3X+4Z=4..............(3)

Solution: Z= 1-0.75X (4) can be obtained from (3).

Substitute (1) and (4) into (2)

X=24/ 19。

Substitute x=24/ 19 into (1) to get y=-85/ 19.

Substitute x=24/ 19 into (4) to get z =119.

So {x = 24/ 19.

{y=-85/ 19

{z= 1/ 19