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sassyj

  • 2 years ago

What is the solution of the system? Use substitution. x = –2y + 10 –6y = 6x – 6 z = –3x + 10y

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  1. sassyj
    • 2 years ago
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    A. (6, 12) B. (–12, –6) C. (–6, –12) D. (2, 4)

  2. sassyj
    • 2 years ago
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    Is it A?

  3. Aditi_Singh
    • 2 years ago
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    Solve two at a time.

  4. Callisto
    • 2 years ago
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    1. Label the three equations x = –2y + 10 -(1) –6y = 6x – 6 -(2) z = –3x + 10y -(3) 2. Sub equation (1) into equation (2). Then solve it, you can get the value of y... Hmm... Are you posting the right question?

  5. sassyj
    • 2 years ago
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    A. x = 9, y = –8, z = 114 B. x = –8, y = 9, z = 114 C. x = –8, y = 114, z = 9 D. x = 114, y = 9, z = –8

  6. hartnn
    • 2 years ago
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    yeah, now options are correct....

  7. sassyj
    • 2 years ago
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    I posted the wrong options- now, would it be A?

  8. Callisto
    • 2 years ago
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    How do you get A?

  9. sassyj
    • 2 years ago
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    9, -8

  10. Aditi_Singh
    • 2 years ago
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    No, it won't be A ..

  11. Aditi_Singh
    • 2 years ago
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    What did you get on solving the equations? x,y.z?

  12. Callisto
    • 2 years ago
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    @sassyj Can you solve the first two equations or do you need help?

  13. sassyj
    • 2 years ago
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    I cant do it

  14. sassyj
    • 2 years ago
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    I dont get any of this-even reading the textbook

  15. Callisto
    • 2 years ago
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    x = –2y + 10 -(1) –6y = 6x – 6 -(2) z = –3x + 10y -(3) Sub equation (1) into equation (2), that means when you see x, replace x by –2y + 10. Do you get this part?

  16. sassyj
    • 2 years ago
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    yes

  17. Callisto
    • 2 years ago
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    So, try it. Sub. (1) into (2), what do you get?

  18. Callisto
    • 2 years ago
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    If you really don't understand how substitution works, I suggest you to watch a short video on Khan Academy first http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/v/practice-using-substitution-for-systems

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