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