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