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mathcalculus

  • one year ago

I DON'T UNDERSTAND WHY MY ANSWER IS NOT CORRECT :( SLOPE IS -9/11 AND THE EQUATION IS -9X/11+44 Find the equation of the line parallel to -9x-11y=-2 and passing through the point (5,-1). The equation of the line is ??

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  1. Mertsj
    • one year ago
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    The slope of -9x-11y=-2 is -9/11 So plug that slope and the given point into point-slope form: \[y-y _{1}=m(x-x _{1})\]

  2. mathcalculus
    • one year ago
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    i did..

  3. whpalmer4
    • one year ago
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    @mathcalculus you did your algebra incorrectly, it appears...

  4. mathcalculus
    • one year ago
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    can you point it out where?

  5. Mertsj
    • one year ago
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    \[y-(-1)=\frac{-9}{11}(x-5)\]

  6. Mertsj
    • one year ago
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    Simplify and you will be done.

  7. mathcalculus
    • one year ago
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    i have this: y=9x/11 +44

  8. whpalmer4
    • one year ago
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    your y-intercept value will be a fraction...maybe you didn't multiply the -9/11 when expanding

  9. mathcalculus
    • one year ago
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    @whpalmer4 i'm not sure where I have made my mistake.

  10. whpalmer4
    • one year ago
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    \[1+y = \frac{1}{11}(45-9x)\]probably screwed up bringing the 1 across

  11. Mertsj
    • one year ago
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    \[y+1=\frac{-9}{11}x+\frac{45}{11}\]

  12. mathcalculus
    • one year ago
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    isn't y- (-1) a y+1?

  13. mathcalculus
    • one year ago
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    so if i bring it to the other side it must be subtracted from the 45

  14. mathcalculus
    • one year ago
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    oh yes! got it

  15. mathcalculus
    • one year ago
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    damn

  16. mathcalculus
    • one year ago
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    9/11 * 5

  17. Mertsj
    • one year ago
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    \[y=\frac{-9}{11}x+\frac{45}{11}-1=\frac{-9}{11}x+\frac{34}{11}\]

  18. whpalmer4
    • one year ago
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    subtract 11/11 from each side: \[y+1 - 11/11 = \frac{1}{11}{45-11-9x}\]\[y = \frac{1}{11}(34-9x)\]\[y = -\frac{9x}{11}+\frac{34}{11}\]

  19. whpalmer4
    • one year ago
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    whoops, used invisible () in that first eq. :-)

  20. mathcalculus
    • one year ago
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    that's not the answer..... :(

  21. mathcalculus
    • one year ago
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    it keeps saying it's wrong.

  22. mathcalculus
    • one year ago
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    i think it's the website, it must be correct. thank you everyone.

  23. whpalmer4
    • one year ago
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    well, that in fact is the equation of a line parallel to the original line, passing through -5,1 as you can see in this graph:

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  24. Mertsj
    • one year ago
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    Check the rules for entry. Maybe you are entering the fractions incorrectly or maybe you are not supposed to write y = or maybe they want the equation in some other form besides slope-intercept form.

  25. whpalmer4
    • one year ago
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    (5,-1) that is

  26. mathcalculus
    • one year ago
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    yes, I checked. appreciate the help

  27. mathcalculus
    • one year ago
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    yup

  28. mathcalculus
    • one year ago
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    it must be correct, even the calculator shows it.

  29. Mertsj
    • one year ago
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    Maybe you want to try 9x+11y=34

  30. whpalmer4
    • one year ago
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    I'll sometimes multiply by the denominator of the fraction, do the problem without the pesky fractions and accompanying mistakes, then divide again by the former denominator for the final answer.

  31. whpalmer4
    • one year ago
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    I'd say you know what you're doing, in any case...watch for those fraction mistakes :-)

  32. mathcalculus
    • one year ago
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    thanks alot ! :)

  33. Mertsj
    • one year ago
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    yw

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