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anonymous

  • 5 years ago

solve by the elimination method 0.3x - 0.2y=4 0.5x + 0.3y = 71/23

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  1. amistre64
    • 5 years ago
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    yikes!! thats scary :)

  2. anonymous
    • 5 years ago
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    0.3x-0.2y=4 0.5x+0.3y=71/23 so, first you have to get rid of the y from both equations

  3. anonymous
    • 5 years ago
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    right! i'm clueless, the fraction throws me off!

  4. anonymous
    • 5 years ago
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    It is simple: multiply both equations, so that the y members of both of them are eliminated when added so in your case, we can multiply the first equation by 3, to get 0.9x-0.6y=12 and now we need to multiply the second equation in such a way that when coresponding members of both of them are added, y is eliminated (equals zero) so, we have to multiply it by 2 to get 1x+0.6y=142/23

  5. anonymous
    • 5 years ago
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    now, we have to add all coresponding members to eliminate y, so 0.9x-0.6y=12 + 1x+0.6y=142/23 _________________________ 1.9x+0=418/23 =1.9x=418/23

  6. anonymous
    • 5 years ago
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    ok, i follow you so far ....

  7. anonymous
    • 5 years ago
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    so, now lets solve for x 1.9x=418/23 23*1.9x=418 43.7x=418 x=418/43.7 x=9.56521

  8. anonymous
    • 5 years ago
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    i have to solve it as a fraction, so i'm plugging in 418/43.7 to solve for y ....

  9. anonymous
    • 5 years ago
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    now to get y we just take any equation, and substitute x into it, and solve for y 0.3x-0.2y=4 0.3*9.56521-0.2y=4 2.869565217-0.2y=4 -0.2y=4-2.869565217 -0.2y=1.130434 y=1.130434/-0.2 y=-5.65

  10. anonymous
    • 5 years ago
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    if I helped in anyway, I would apreciate if you would fan me (reload this page, and click a blue Become a fan button near my name)

  11. anonymous
    • 5 years ago
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    x~~9.56522, y~~-5.65217

  12. anonymous
    • 5 years ago
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    yes, thats correct

  13. anonymous
    • 5 years ago
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    what is y as a fraction?

  14. anonymous
    • 5 years ago
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    that is y as a decimal

  15. anonymous
    • 5 years ago
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    my answer has to be in the form of a fraction

  16. anonymous
    • 5 years ago
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  17. anonymous
    • 5 years ago
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    to get it as a fraction, just do same steps as I showed you, just keep pluging in fractions all the way from the beginning until now, and you can get a fraction

  18. anonymous
    • 5 years ago
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    x=220/23

  19. anonymous
    • 5 years ago
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    ok, thx! and i became a fan while you were working on my problem, thx!

  20. anonymous
    • 5 years ago
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    y=-130/23

  21. anonymous
    • 5 years ago
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    Got the fraction?

  22. anonymous
    • 5 years ago
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    x=220/23 y=-130/23

  23. anonymous
    • 5 years ago
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    great, thx!

  24. anonymous
    • 5 years ago
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    You are welcome, and look at the plot that will help you understand

  25. anonymous
    • 5 years ago
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    If you any more problems, you can send it my way, I will be happy to answer

  26. anonymous
    • 5 years ago
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    great, thx for your help!

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