Question

x-y=0

x+y+z=4

x+2y+3z=9

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Answer 1

x=y

y+y+z=4

y+2y+3z=9

 

x=y

2y+z=4

3y+3z=9

 

x=y

z=4-2y

3y+3z=9

 

x=y

z=4-2y

3y+3(4-2y)=9

 

x=y

z=4-2y

3y+12-6y=9

 

 

x=y

z=4-2y

-3y=-3   / : (-3)

 

x=y

z=4-2y

y=1

 

x=1

z=4-2*1

y=1

 

x=1

z= 2

y=1

 

x=1

y=1

z=2