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mathcalculus

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 ??

  • 9 months ago
  • 9 months ago

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  1. Mertsj
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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: \[y-y _{1}=m(x-x _{1})\]

    • 9 months ago
  2. mathcalculus
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    i did..

    • 9 months ago
  3. whpalmer4
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    @mathcalculus you did your algebra incorrectly, it appears...

    • 9 months ago
  4. mathcalculus
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    can you point it out where?

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

    • 9 months ago
  6. Mertsj
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    Simplify and you will be done.

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

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

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

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

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

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

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

    • 9 months ago
  14. mathcalculus
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    oh yes! got it

    • 9 months ago
  15. mathcalculus
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    damn

    • 9 months ago
  16. mathcalculus
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    9/11 * 5

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

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

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

    • 9 months ago
  20. mathcalculus
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    that's not the answer..... :(

    • 9 months ago
  21. mathcalculus
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    it keeps saying it's wrong.

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

    • 9 months ago
  23. whpalmer4
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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:

    • 9 months ago
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  24. Mertsj
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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.

    • 9 months ago
  25. whpalmer4
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    (5,-1) that is

    • 9 months ago
  26. mathcalculus
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    yes, I checked. appreciate the help

    • 9 months ago
  27. mathcalculus
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    yup

    • 9 months ago
  28. mathcalculus
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    it must be correct, even the calculator shows it.

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

    • 9 months ago
  30. whpalmer4
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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.

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

    • 9 months ago
  32. mathcalculus
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    thanks alot ! :)

    • 9 months ago
  33. Mertsj
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    yw

    • 9 months ago
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