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anonymous

  • 5 years ago

Solve by elimination method: 9x-9y=36 7y-3x=-14 Another problem: 0.3x-0.2y=4 0.4x+0.5y=1

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  1. anonymous
    • 5 years ago
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    Hello i will help you today

  2. anonymous
    • 5 years ago
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    thanks

  3. anonymous
    • 5 years ago
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    .3x - .2y = 4 -->(1) .4x + .5y = 1 -->(2) (1)x5 you get 1.5x - y = 20 (2)x2 you get .8x + y = 2 Add up these two, you get 2.3x = 22 x = 220/23 Substitute x back into any equation, you get y = -130/23 and 5x +3y = -11 -- (1) 7x - 2y =19 -- (2) (1)x2 you get 10x + 6y = -22 (2)x3 you get 21x - 6y = 57 Add the two, you get 31x = 35 So x = 35/31 Substitute x back into any equation, you get y = 172/31 and 9x - 9y =36 -- (1) 7y - 3x = -14 -- (2) (2)x3 you get -9x + 21y = -42 Add this to (1), you get 12y = -6, so y = -1/2 Substitute y back into any equation, you get x = 7/2

  4. anonymous
    • 5 years ago
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    tell me if that helps at all

  5. anonymous
    • 5 years ago
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    the one problem i think you wrote wrong it was supposed to be 5x+2y=-7 7x-3y=11

  6. anonymous
    • 5 years ago
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    ok i am srry hold on

  7. anonymous
    • 5 years ago
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    okay

  8. anonymous
    • 5 years ago
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    wait nevermind i wrote it wrong

  9. anonymous
    • 5 years ago
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    5x+2y=-13 7x-3y=17

  10. anonymous
    • 5 years ago
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    ok here we go 9x-9y=36 => x - y = 4 => x = 4+y 7y-3x=-14 => 7y - 3(4+y) = -14 7y - 12 - 3y = -14 4y = -2 y = -1/2 x = 4-1/2 = 7/2 (x,y) = (7/2, -1/2)

  11. anonymous
    • 5 years ago
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    would you mind helping me on a few more

  12. anonymous
    • 5 years ago
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    no i would love to

  13. anonymous
    • 5 years ago
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    5x+2y=-13 7x-3y=17 0.05x+0.25=11 0.15x+0.05y=12

  14. anonymous
    • 5 years ago
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    Substitution method: 7m+n=46 m-3n=16

  15. anonymous
    • 5 years ago
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    Im really having trouble with the substitution one

  16. anonymous
    • 5 years ago
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    ok

  17. anonymous
    • 5 years ago
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    umm i cant to seem to get this won hold on and i am going to have some won help if that is ok with you

  18. anonymous
    • 5 years ago
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    well what would the elimination problems be i sent you

  19. anonymous
    • 5 years ago
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    ok is this it tight here Start by multiplying the first equation by 2, and the second by 3: 10x + 6y = -22 21x - 6y = 39 Now add the two together, you y's cancel out , "eliminating" it. 21x = 17 x = 17/21 5x + 3y = -11 5(17/21) + 3y = -11 85/21 + 3y = -11 85 + 63y = -231 63y = -146 y = -146 / 63

  20. anonymous
    • 5 years ago
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    okay thanks how about 0.05x+0.25y=11 0.15x+0.05y=12

  21. anonymous
    • 5 years ago
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    ok here we go 5x + 25 y = 1100 15 x + 5 y = 1200 - 15x - 75y = - 3300 15x + 5y = 1200-----------ADD - 70 y = - 2100 y = 30 5x + 750 = 1100 5x = 350 x = 70 x = 70 , y = 30

  22. anonymous
    • 5 years ago
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    wow thanks your like a lifesaver haha

  23. anonymous
    • 5 years ago
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    np i love to help

  24. anonymous
    • 5 years ago
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    5x+5y=-11 7x-3y=17

  25. anonymous
    • 5 years ago
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    this is done by elimination

  26. anonymous
    • 5 years ago
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    i am on it

  27. anonymous
    • 5 years ago
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    thanks!!!

  28. anonymous
    • 5 years ago
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    5x+5y=-11 multiply by 2 ==> 10x + 10y = -22 7x-2y=17 multiply by 5 ===> 35x - 10y = 85 Add the two equations: 10x + 35x = -22+85 45x = 63 x = 63/45 = 7/5 substitute into original equation: 5(7/5) + 5y = -11 5y = -18 y = -18/5 Solution set: (x,y) = (7/5, -18/5) ok do this help

  29. anonymous
    • 5 years ago
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    it told me i was wrong

  30. anonymous
    • 5 years ago
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    ummm that is weird

  31. anonymous
    • 5 years ago
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    what r ypu working on so i know i might know why

  32. anonymous
    • 5 years ago
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    its a math program and I have to enter the answers in and it lets me know if im wrong or not then submits it to my teacheer part of my homeschool

  33. anonymous
    • 5 years ago
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    ok i do home schooling to i think i know what programe you talking about

  34. anonymous
    • 5 years ago
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    okay

  35. anonymous
    • 5 years ago
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    umm that i weird i woundr were we went wrong

  36. anonymous
    • 5 years ago
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    i dunno im trying to figure it out too

  37. anonymous
    • 5 years ago
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    Ill rewrite the problem

  38. anonymous
    • 5 years ago
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    5x+5y=-11 7x-3y=17

  39. anonymous
    • 5 years ago
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    ok

  40. anonymous
    • 5 years ago
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    ok i think i got it Let's just multiply everything by 100 to eliminate the decimals. 5x + 25y = 1100 15x + 5y = 1200 Multiply the first equation by 3 15x + 75y = 3300 15x + 5y = 1200 Subtract the second equation from the first 70y = 2100 7y = 210 y = 30 15x + 5(30) = 1200 15x + 150 = 1200 15x = 1200 -150 15x = 1050 x = 1050/15 = 70 Let's check in the original equations. 0.05(70) + 0.25(30) = 3.50 + 7.50 = 11 check. 0.15(70) + 0.05(30) = 10.50 + 1.50 = 12 check. 8 months ago Report Abuse

  41. anonymous
    • 5 years ago
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    srry about the 8 month ago i did that srry

  42. anonymous
    • 5 years ago
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    its okay

  43. anonymous
    • 5 years ago
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    i was working on something els and it got out up there

  44. anonymous
    • 5 years ago
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    did you see the word problem i posted could you help me with that

  45. anonymous
    • 5 years ago
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    did you ever figure out that one problem for me

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