Applications and equations

Algebra
Tutor: None Selected Time limit: 1 Day

Determine whether (-1,5,5) is a solution to the system of equations:

x+y+z=9

x+2y+z=4

2x+2y-z=-11

Sep 11th, 2015

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eq 1

x+y+z=9

-1+5+5 =9

9=9 (This is correct)

eq 2

x+2y+z=4

-1 +2(5) +5= 4

-1+10+5=4

14=4 (This is not correct)

(-1,5,5) is therefore not a solution to the system of equations:

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 11th, 2015

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