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dumbsearch2

  • one year ago

Solve the following system using the substitution method: 2x = y 6x + 4y = -14

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  1. AravindG
    • one year ago
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    ok giveb y=2x

  2. AravindG
    • one year ago
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    *given

  3. AravindG
    • one year ago
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    now replace y in second equation with 2x

  4. AravindG
    • one year ago
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    then solve for x

  5. AravindG
    • one year ago
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    having got x substitute its value in first equation to get y

  6. ParthKohli
    • one year ago
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    So you understand Aravind's explanation?

  7. ParthKohli
    • one year ago
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    LOL, I am red as long as I don't refresh

  8. dumbsearch2
    • one year ago
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    haha! ;D

  9. dumbsearch2
    • one year ago
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    no i don't understand. :(

  10. AravindG
    • one year ago
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    where exactly you have doubt @dumbsearch2 ?

  11. hba
    • one year ago
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    Plug in y=2x in eq(2)

  12. dumbsearch2
    • one year ago
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    how to find x

  13. ParthKohli
    • one year ago
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    \[\color{#C00}{2x} = y\]\[6x + 4\color{#T00}{\cdot y} = 6x + 4\cdot \color{#C00}{2x}\]

  14. dumbsearch2
    • one year ago
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    how to find x? cause to find y you need to know x right?

  15. hba
    • one year ago
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    how to find y ? cause to find x you need to know y right?

  16. AravindG
    • one year ago
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    you have an equation containing only x when you substitute y with x.Then solve for x

  17. AravindG
    • one year ago
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    gt it now @dumbsearch2 ?

  18. dumbsearch2
    • one year ago
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    nope. :( sorry I'm dumb...

  19. AravindG
    • one year ago
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    try to read the replies above again, try to understand what is said .

  20. Callisto
    • one year ago
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    The first equation we have is 2x = y, that is the same as y=2x. The second equation we have is 6x + 4y = -14. Now, we put y=2x into the second equation. That is whenever we see "y" in the second equation, we re-write it as "2x" So, we get: 6x + 4 (2x) = -14 Can you solve this?

  21. ParthKohli
    • one year ago
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    You know that \(2x = y\), right? So can you say that \(6x + 4y =14\) can be written as \(6x + 4(2x) = 14\)?

  22. dumbsearch2
    • one year ago
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    x = -4 right?/

  23. dumbsearch2
    • one year ago
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    no i mean -1? no?

  24. ParthKohli
    • one year ago
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    Hmm... yes!

  25. dumbsearch2
    • one year ago
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    so y = -2! so y = -2, and x= -1! no?

  26. ParthKohli
    • one year ago
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    Sorry, it's not \(6x + 4y = 14\). I got my reply wrong :-P

  27. ParthKohli
    • one year ago
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    Yesh!

  28. Callisto
    • one year ago
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    *Clapping hands*

  29. ParthKohli
    • one year ago
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    Yay!

  30. dumbsearch2
    • one year ago
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    :DD thanks so MUCHJ GUYS! im trying so hard to finish math online course for tomrrow... it closes on tomorrow, and I've got 2 units to do online!!! (each unit has like 4 lessons and 4 quizes) I'm kinda bad at the subtituation method and stuff, wish I would understand! it techinically is tomorrow, I mean it's the very very very early morning right now!!i know! I'm trying to use openstudy to help me too... (that's how I stumbled upon this site today!)

  31. dumbsearch2
    • one year ago
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    So like this! (Confirm! :))

  32. ParthKohli
    • one year ago
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    Yes :-)

  33. dumbsearch2
    • one year ago
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    yeaa! ;D

  34. dumbsearch2
    • one year ago
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    got a 75% grade in the quiz, not bad. :D

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