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whadduptori

  • 3 years ago

What is the solution of the system of equations? somebody please help. can someone show me work? 3x+2y+z= 7 5x+5y+4z=3 3x+2y+3z=1

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  1. jhonyy9
    • 3 years ago
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    how you need to solve it with sustitution method or elimination method ?

  2. whadduptori
    • 3 years ago
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    I found z by using the equations 1 and 3 and it doesnt tell i need help with x and y

  3. jhonyy9
    • 3 years ago
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    ok i see it you can get the value of z using first end 3rd equation so how and how many you have got for z ?

  4. whadduptori
    • 3 years ago
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    i got z=-3 and i know the answer for y is -1 and x is 4 but i dont know how to get them

  5. jhonyy9
    • 3 years ago
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    yes z=-3 is right sure so than this value of z=-3 you can using there in first and second equation so than what will get if you us this value of z there ? what will get for first equation and what for second ?

  6. whadduptori
    • 3 years ago
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    wait how would set the up?

  7. whadduptori
    • 3 years ago
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    this?

  8. jhonyy9
    • 3 years ago
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    3x+2y-3=7 5x+5y+4*(-3)=3 so can you make the calcule here ?

  9. jhonyy9
    • 3 years ago
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    courage this is easy

  10. whadduptori
    • 3 years ago
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    how do you figure this out? i feel like an idiot right now

  11. jhonyy9
    • 3 years ago
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    in the first equation assun to both sides 3 and will get how many ? so and for second equation multiplie 4 by (-3) and will get how many ?

  12. jhonyy9
    • 3 years ago
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    so you dont wann making the calcules here for ?

  13. whadduptori
    • 3 years ago
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    -12 for the second equation?

  14. jhonyy9
    • 3 years ago
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    but how will be firstly the first equation ?

  15. jhonyy9
    • 3 years ago
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    3x+2y=10 do you understand how i have got this result ?

  16. whadduptori
    • 3 years ago
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    oh okay! you added plus three to the 7? and so the 3 crosses out then?

  17. jhonyy9
    • 3 years ago
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    yes sure so than how you get the second equation ?

  18. whadduptori
    • 3 years ago
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    5x+5y-12=-9

  19. jhonyy9
    • 3 years ago
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    equal 3 and not -9

  20. whadduptori
    • 3 years ago
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    okay so what do i do after that?

  21. jhonyy9
    • 3 years ago
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    so will get 5x+5y-12=3 so now add to both sides 12 and will get ????

  22. whadduptori
    • 3 years ago
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    5x+5y=15

  23. jhonyy9
    • 3 years ago
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    yes so now there are two equation 3x+2y=10 5x+5y=15 yes ?

  24. jhonyy9
    • 3 years ago
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    ok ?

  25. whadduptori
    • 3 years ago
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    okay! got it so far

  26. jhonyy9
    • 3 years ago
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    can you solve these system for x and y ?

  27. whadduptori
    • 3 years ago
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    yeah let me work it out

  28. whadduptori
    • 3 years ago
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    ok now im confused

  29. jhonyy9
    • 3 years ago
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    3x+2y=10 5x+5y=15 so first of all how do you see what can you factorizing out in the second equation ?

  30. whadduptori
    • 3 years ago
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    15?

  31. jhonyy9
    • 3 years ago
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    why 15 ? and why not just 5 ???

  32. whadduptori
    • 3 years ago
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    5

  33. jhonyy9
    • 3 years ago
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    yes 5 right so than how will be the second equation ?

  34. whadduptori
    • 3 years ago
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    im sorry what do you mean?

  35. jhonyy9
    • 3 years ago
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    5x+5y=15 i have wrote above that you can factorizing out the 5 from the both sides but i mean that you can divide both sides by 5 and so will get 5x+5y=15 /5 x+y=3 ok ?

  36. whadduptori
    • 3 years ago
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    okay i see what your ssaying

  37. jhonyy9
    • 3 years ago
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    so than now there are 3x+2y=10 x+y=3 can you solve it now ?

  38. whadduptori
    • 3 years ago
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    what will you solve first the x or y? do you need to get rid of one?

  39. whadduptori
    • 3 years ago
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    i got it! i got the answr for y! y=-1

  40. jhonyy9
    • 3 years ago
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    how ?

  41. jhonyy9
    • 3 years ago
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    3x+2y=10 x+y=3 --- y=3-x than this substitute in place of y in the first equation 3x+2(3-x)=10 3x+6-2x=10 x+6=10 x=10-6 x=4 ok ?

  42. whadduptori
    • 3 years ago
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    ah thats why i just for x! i get it thank you!

  43. jhonyy9
    • 3 years ago
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    so than 4 +y=3 y=3-4 y=-1 so than result that you have got it right ok ?

  44. whadduptori
    • 3 years ago
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    yup! thats what i did, thank you so much

  45. jhonyy9
    • 3 years ago
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    was my pleasure yw good luck bye

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