Kes E.

asked • 10/29/13

what is the answer

x+2y+z=7
x-y+z=1
2x+3y-z=9

1 Expert Answer

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Andre W. answered • 10/29/13

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PhD in Physics with 20+ Years of Teaching Experience
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Subtract the second from the first equation, get y=2.
 
Add the second and the third equation, get 3x+2y=10. With y=2, you get x=2.
 
The second equation now gives you z=1-x+y=1.
 
So the solution is (2,2,1).
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Kes E.

which method did you use?elimination or substitution?
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10/29/13

Andre W.

tutor
Elimination to get y=2.
Elimination and substitution to get x=2.
Substitution to get z=1.
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10/29/13

Kes E.

thank you
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10/29/13

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