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anonymous

  • one year ago

consider this systems of equations 2/3 x +3/5 y =12 5/2 y - 3x=6 the expression that gives the value of x is... the solution for the systems of equations...

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  1. wolf1728
    • one year ago
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    Do you know how to solve simultaneous equations?

  2. anonymous
    • one year ago
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    no

  3. wolf1728
    • one year ago
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    A) 2/3 x +3/5 y =12 B) -3x +5/2 y =6 One way is to solve for x in one equation

  4. anonymous
    • one year ago
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    I don't get it

  5. wolf1728
    • one year ago
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    B) -3x = -5/2 y + 6 We divide both sides by -3 x = 5/6 y -2

  6. anonymous
    • one year ago
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    options the expression that gives the value of x is... (5A/3)+(2B/5), (3A/5)-(5B/2), (5A/2)+(3B/5), (5A/3)-(2B/5), (3A/2) + (B/3)

  7. UsukiDoll
    • one year ago
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    mcfizzy STOP! What is that attachment?

  8. anonymous
    • one year ago
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    the solution to the systems of equations is (1118/47, 396/47) (33/13, 50/13) (99/13, 150/13) (8,12)

  9. anonymous
    • one year ago
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    @UsukiDoll what's wrong?

  10. UsukiDoll
    • one year ago
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    I've seen this poster (mcfizzy) posting an attachment that could be malicious. I've sent a report.

  11. anonymous
    • one year ago
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    okay, I probably shouldn't click on the attachment then. I'll send a report too.

  12. UsukiDoll
    • one year ago
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    yeah.. under his profile all of his questions answered has spam with that attachment. everyone please report this.

  13. anonymous
    • one year ago
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    I could use help with this problem, I'm still very confused

  14. wolf1728
    • one year ago
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    x = 99/13 y = 150/13

  15. UsukiDoll
    • one year ago
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    @wolf1728 is there to help. I have to warn everyone else about this issue as this is serious and against terms and conditions.

  16. anonymous
    • one year ago
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    okay thank you

  17. anonymous
    • one year ago
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    @wolf1728 I also need the expression that gives the value of x

  18. wolf1728
    • one year ago
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    Kaelyn - you do not know how to solve these so why do you need the expression for value of x ?

  19. anonymous
    • one year ago
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    because the question asks me to find the expression that finds the value of x, I don't want you to give me the answer just help me find the right one

  20. wolf1728
    • one year ago
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    I think you should find someone else to help. I'm quitting for the moment.

  21. anonymous
    • one year ago
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    okay thank you for your help

  22. anonymous
    • one year ago
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    please help

  23. anonymous
    • one year ago
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    May I try?

  24. UsukiDoll
    • one year ago
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    go for it @waterineyes as long as it's not a direct answer

  25. anonymous
    • one year ago
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    go ahead @waterineyes

  26. anonymous
    • one year ago
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    and @UsukiDoll I agree don't give the answer to me just help me find the answer myself

  27. anonymous
    • one year ago
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    Okay, don't let our interaction stop anywhere, just reply if you know or not, just be with me...

  28. anonymous
    • one year ago
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    okay

  29. LynFran
    • one year ago
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    \[\frac{ 2 }{ 3 }x+\frac{ 3 }{ 4 }y=12\]\[\frac{ 5 }{ 2}y-3x=6\]frm equation 2,\[\frac{ 5 }{ 2 }y=6+3x\]\[y=\frac{ 2(6+3x) }{ 5 }\]now sub y=2(6+3x)/5 in eq 1 \[\frac{ 2 }{ 3 }x+\frac{ 3 }{ 4 }(\frac{ 2(6+3x) }{ 5 })=12\]simplify and solve for x we get \[\frac{ 2 }{ 3 }x+\frac{ 36+18x }{ 20 }=12\]\[\frac{ 40x +108+54x}{ 60 }=12\]\[\frac{ 94x+108 }{ 60 }=12\]multiply both side of the equation we get..\[94x+108=720\]\[94x=720-108\]\[x=612/94\]\[x=6.510638\]...so y =...\[y=\frac{ 2(6+3(6.510638)) }{ 5 }\]\[y=10.21276\]..

  30. anonymous
    • one year ago
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    okay understanding so far

  31. UsukiDoll
    • one year ago
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    -_- *throws a water bottle @waterineyes

  32. anonymous
    • one year ago
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    Both our equations are in fraction form, we should simplify them to make a good looking equation first... Do you know how to take LCM?

  33. anonymous
    • one year ago
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    Hell, my net stopped working.. :(

  34. anonymous
    • one year ago
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    Yes I know how to take LCM

  35. anonymous
    • one year ago
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    Like in first equation, 15 is the LCM, so you can multiply whole equation by 15...

  36. anonymous
    • one year ago
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    @LynFran I am afraid you are right everywhere, but you have taken wrong fraction in very first equation,, 3/5 is good, not 3/4.. if I am not blind then.. :P Your method is good.. :)

  37. UsukiDoll
    • one year ago
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    if we find our y and x, keep it in fraction form. ... decimals are a pain to deal with T_T

  38. UsukiDoll
    • one year ago
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    *throws a canteen at @waterineyes

  39. anonymous
    • one year ago
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    Guys lets not throw things...

  40. LynFran
    • one year ago
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    o i see im sleepy lol @waterineyes goodnight u guys

  41. anonymous
    • one year ago
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    Goodnight @LynFran

  42. anonymous
    • one year ago
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    \(10x + 9y = 180\) --- 1 This you got?

  43. UsukiDoll
    • one year ago
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    what is that ?

  44. UsukiDoll
    • one year ago
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    sigh....... the second equation is easier to deal with 2/3 x +3/5 y =12 5/2 y - 3x=6 \[\frac{2}{3}x+\frac{3}{5}y=12\] \[\frac{5}{2}y-3x=6\] so multiply 2 throughout the entire second equation \[\frac{5}{2}y-3x=6\]

  45. anonymous
    • one year ago
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    And this way your second equation becomes: \(5y - 6x = 12\) --------- 2

  46. UsukiDoll
    • one year ago
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    uh huh

  47. anonymous
    • one year ago
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    @Kaelyn78 are you getting how I formed these two equations?

  48. anonymous
    • one year ago
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    yes I understand

  49. UsukiDoll
    • one year ago
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    10x + 9y = 180 5y-6x=12

  50. anonymous
    • one year ago
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    Thanks.. Again and again I was going above to see these equations, as you are posting in between so things are going above..

  51. anonymous
    • one year ago
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    you can write the second equation, other way round, x first and then y: \(10x + 9y = 180 \\ -6x + 5y = 12\)

  52. anonymous
    • one year ago
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    \[[10x + 9y = 180 ] \times 6 = 60x + 45y = 108 \\ [-6x + 5y = 12 ] \times 10 = -60x + 50y = 120\]

  53. anonymous
    • one year ago
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    I have multiplied the coefficient of x in second equation with first equation and same for second equation.. are you getting this step?

  54. anonymous
    • one year ago
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    yes I understand

  55. anonymous
    • one year ago
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    Now you just need to add those equations...

  56. anonymous
    • one year ago
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    \[\cancel{60x} + 45y = 1080 \\ \cancel{-60x} + 50y = 120 \\ --------- \\95y = 2200\]

  57. anonymous
    • one year ago
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    Sorry, that is 1080 and not 108...

  58. anonymous
    • one year ago
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    okay

  59. anonymous
    • one year ago
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    Getting previous step?

  60. anonymous
    • one year ago
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    yes I'm getting it

  61. anonymous
    • one year ago
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    Now find y, by dividing by 95 both the sides..

  62. anonymous
    • one year ago
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    23?

  63. anonymous
    • one year ago
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    Wait, I am just double checking it.. Let me take copy and pen too..

  64. anonymous
    • one year ago
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    It is certainly a wrong...

  65. anonymous
    • one year ago
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    9 multiplied by 6 is 54 not 45, just keep eyes on what I am doing, I can be wrong anywhere in writing digits. :P

  66. anonymous
    • one year ago
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    After Multiplying 6 and 10 the equations you will get are: \(60x + 54y = 1080 \\ -60x + 50y = 120\) Form this you will get: \(104y = 2200\)

  67. anonymous
    • one year ago
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    Kill me.....

  68. anonymous
    • one year ago
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    1080 + 120 = 1200.. What has happened to me today.. :(

  69. anonymous
    • one year ago
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    @waterineyes aw sorry I can't help with that

  70. anonymous
    • one year ago
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    \(104y = 1200\) Now just find y by cancelling out the things..

  71. anonymous
    • one year ago
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    if it's any consolation I would have gone certifiably insane trying to do this all by myself

  72. anonymous
    • one year ago
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    thank you

  73. anonymous
    • one year ago
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    \[y = \frac{1200}{104}\]

  74. UsukiDoll
    • one year ago
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    gotta reduce that fraction

  75. anonymous
    • one year ago
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    Do not use calculator, just cancel it out with 8, you will get in fraction..

  76. anonymous
    • one year ago
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    Now, put the fraction in any one of the equation above to find x...

  77. anonymous
    • one year ago
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    Found value of y?

  78. UsukiDoll
    • one year ago
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    \[y=\frac{150}{13}\] 5y-6x=12 plug in y in this equation and solve for x

  79. UsukiDoll
    • one year ago
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    what are you talking about? I didn't post that.

  80. UsukiDoll
    • one year ago
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    \[5(\frac{150}{13})-6x=12\]

  81. anonymous
    • one year ago
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    @Kaelyn78 what you got for y? You break the interaction?? :(

  82. anonymous
    • one year ago
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    Okay, I gotta go now. If any doubt, Doll will tell you, or I will when I login next.. :) Solving these types of equations is really an easy task, just learn the concept, rest is a-jiffy work..

  83. anonymous
    • one year ago
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    sorry fell asleep

  84. anonymous
    • one year ago
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    I'm going to bed, thanks everyone, goodnight

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