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Mathematics People's Education Edition textbook 1 14 pages Exercise 8.4 questions 1 (important process)
Y=2X-7...........( 1)

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