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mathcalculus

  • 2 years 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
    • 2 years 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
    • 2 years ago
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    i did..

  3. whpalmer4
    • 2 years ago
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    @mathcalculus you did your algebra incorrectly, it appears...

  4. mathcalculus
    • 2 years ago
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    can you point it out where?

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

  6. Mertsj
    • 2 years ago
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    Simplify and you will be done.

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

  8. whpalmer4
    • 2 years 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
    • 2 years ago
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    @whpalmer4 i'm not sure where I have made my mistake.

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

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

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

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

  14. mathcalculus
    • 2 years ago
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    oh yes! got it

  15. mathcalculus
    • 2 years ago
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    damn

  16. mathcalculus
    • 2 years ago
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    9/11 * 5

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

  18. whpalmer4
    • 2 years 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
    • 2 years ago
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    whoops, used invisible () in that first eq. :-)

  20. mathcalculus
    • 2 years ago
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    that's not the answer..... :(

  21. mathcalculus
    • 2 years ago
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    it keeps saying it's wrong.

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

  23. whpalmer4
    • 2 years 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
    • 2 years 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
    • 2 years ago
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    (5,-1) that is

  26. mathcalculus
    • 2 years ago
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    yes, I checked. appreciate the help

  27. mathcalculus
    • 2 years ago
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    yup

  28. mathcalculus
    • 2 years ago
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    it must be correct, even the calculator shows it.

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

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

  32. mathcalculus
    • 2 years ago
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    thanks alot ! :)

  33. Mertsj
    • 2 years ago
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    yw

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