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anonymous

  • 5 years ago

Use Cramer’s rule to solve the following system. x-y+2z=3 2x+3y+z=9 -x-y+3z=11

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  1. anonymous
    • 5 years ago
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    Find Dx and Dy and Dz

  2. anonymous
    • 5 years ago
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    3 -1 2 9 3 1 11 -1 3 Find determinant of this matrix that is your Dx

  3. anonymous
    • 5 years ago
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    any question?

  4. anonymous
    • 5 years ago
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    Dx/D is x Likewise for y,z

  5. anonymous
    • 5 years ago
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    Do you want me go through the problem?

  6. anonymous
    • 5 years ago
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    Yes please

  7. anonymous
    • 5 years ago
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    Okay

  8. anonymous
    • 5 years ago
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    3 -1 2 9 3 1 11 -1 3 Let's Find the Determinant of this matrix, Dx

  9. anonymous
    • 5 years ago
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    Do you know how to find determinant?

  10. anonymous
    • 5 years ago
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    yes

  11. anonymous
    • 5 years ago
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    is the determinant -38

  12. anonymous
    • 5 years ago
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    Yes

  13. anonymous
    • 5 years ago
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    Now Find Dy

  14. anonymous
    • 5 years ago
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    57

  15. anonymous
    • 5 years ago
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    Dz

  16. anonymous
    • 5 years ago
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    76

  17. anonymous
    • 5 years ago
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    then find determinant of D 1 1 2 2 3 1 1 1 3

  18. anonymous
    • 5 years ago
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    x= Dx/D y= Dy/D z=Dz/D

  19. anonymous
    • 5 years ago
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    wouldn't it be 1 -1 2 2 3 1 1 1 3 because the first system is x-y+2z=3

  20. anonymous
    • 5 years ago
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    Yes, I missed -,sry

  21. anonymous
    • 5 years ago
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    solution set is x=-38,y=57,z=76

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