anonymous
  • anonymous
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 ??
Calculus1
katieb
  • katieb
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Mertsj
  • Mertsj
The slope of -9x-11y=-2 is -9/11 So plug that slope and the given point into point-slope form: \[y-y _{1}=m(x-x _{1})\]
anonymous
  • anonymous
i did..
whpalmer4
  • whpalmer4
@mathcalculus you did your algebra incorrectly, it appears...

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anonymous
  • anonymous
can you point it out where?
Mertsj
  • Mertsj
\[y-(-1)=\frac{-9}{11}(x-5)\]
Mertsj
  • Mertsj
Simplify and you will be done.
anonymous
  • anonymous
i have this: y=9x/11 +44
whpalmer4
  • whpalmer4
your y-intercept value will be a fraction...maybe you didn't multiply the -9/11 when expanding
anonymous
  • anonymous
@whpalmer4 i'm not sure where I have made my mistake.
whpalmer4
  • whpalmer4
\[1+y = \frac{1}{11}(45-9x)\]probably screwed up bringing the 1 across
Mertsj
  • Mertsj
\[y+1=\frac{-9}{11}x+\frac{45}{11}\]
anonymous
  • anonymous
isn't y- (-1) a y+1?
anonymous
  • anonymous
so if i bring it to the other side it must be subtracted from the 45
anonymous
  • anonymous
oh yes! got it
anonymous
  • anonymous
damn
anonymous
  • anonymous
9/11 * 5
Mertsj
  • Mertsj
\[y=\frac{-9}{11}x+\frac{45}{11}-1=\frac{-9}{11}x+\frac{34}{11}\]
whpalmer4
  • whpalmer4
subtract 11/11 from each side: \[y+1 - 11/11 = \frac{1}{11}{45-11-9x}\]\[y = \frac{1}{11}(34-9x)\]\[y = -\frac{9x}{11}+\frac{34}{11}\]
whpalmer4
  • whpalmer4
whoops, used invisible () in that first eq. :-)
anonymous
  • anonymous
that's not the answer..... :(
anonymous
  • anonymous
it keeps saying it's wrong.
anonymous
  • anonymous
i think it's the website, it must be correct. thank you everyone.
whpalmer4
  • whpalmer4
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:
1 Attachment
Mertsj
  • Mertsj
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.
whpalmer4
  • whpalmer4
(5,-1) that is
anonymous
  • anonymous
yes, I checked. appreciate the help
anonymous
  • anonymous
yup
anonymous
  • anonymous
it must be correct, even the calculator shows it.
Mertsj
  • Mertsj
Maybe you want to try 9x+11y=34
whpalmer4
  • whpalmer4
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.
whpalmer4
  • whpalmer4
I'd say you know what you're doing, in any case...watch for those fraction mistakes :-)
anonymous
  • anonymous
thanks alot ! :)
Mertsj
  • Mertsj
yw

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