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whadduptori

  • 2 years ago

What is the solution of the system of equations? somebody please help. I found z i need help with x and y 3x+2y+z= 7 5x+5y+4z=3 3x+2y+3z=1

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  1. baldymcgee6
    • 2 years ago
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    What is z?

  2. whadduptori
    • 2 years ago
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    z=-3

  3. baldymcgee6
    • 2 years ago
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    |dw:1351125106782:dw|

  4. baldymcgee6
    • 2 years ago
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    Now we have x in terms of y... right?

  5. whadduptori
    • 2 years ago
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    wait where did you get the 3x+2y=10

  6. baldymcgee6
    • 2 years ago
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    Adding 3 to both sides

  7. baldymcgee6
    • 2 years ago
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    |dw:1351125353226:dw|

  8. baldymcgee6
    • 2 years ago
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    |dw:1351125376339:dw|

  9. whadduptori
    • 2 years ago
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    oh okay i see now! ok im with you now!

  10. baldymcgee6
    • 2 years ago
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    So if x=10/3 - 2y/3 and z =-3 then we can write 5x+5y+4z=3 5(10/3 - 2y/3) + 5y +4(-3) = 3 We can now solve for y

  11. whadduptori
    • 2 years ago
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    my friend gave me the answer and x=4 y=-1 and z = -3 i got z but i dont know how she got x and y

  12. baldymcgee6
    • 2 years ago
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    Well I just told you how you can solve for y 5(10/3 - 2y/3) + 5y +4(-3) = 3

  13. baldymcgee6
    • 2 years ago
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    |dw:1351125741476:dw|

  14. whadduptori
    • 2 years ago
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    and you get the anwser y=-1

  15. baldymcgee6
    • 2 years ago
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    okay, I trust that you did the math and are not just taking your friends answer. So we have z= -3 and y = -1|dw:1351126015670:dw|

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