## mathcalculus Group Title 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 ?? one year ago one year ago

1. Mertsj

The slope of -9x-11y=-2 is -9/11 So plug that slope and the given point into point-slope form: $y-y _{1}=m(x-x _{1})$

2. mathcalculus

i did..

3. whpalmer4

@mathcalculus you did your algebra incorrectly, it appears...

4. mathcalculus

can you point it out where?

5. Mertsj

$y-(-1)=\frac{-9}{11}(x-5)$

6. Mertsj

Simplify and you will be done.

7. mathcalculus

i have this: y=9x/11 +44

8. whpalmer4

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

9. mathcalculus

@whpalmer4 i'm not sure where I have made my mistake.

10. whpalmer4

$1+y = \frac{1}{11}(45-9x)$probably screwed up bringing the 1 across

11. Mertsj

$y+1=\frac{-9}{11}x+\frac{45}{11}$

12. mathcalculus

isn't y- (-1) a y+1?

13. mathcalculus

so if i bring it to the other side it must be subtracted from the 45

14. mathcalculus

oh yes! got it

15. mathcalculus

damn

16. mathcalculus

9/11 * 5

17. Mertsj

$y=\frac{-9}{11}x+\frac{45}{11}-1=\frac{-9}{11}x+\frac{34}{11}$

18. 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}$

19. whpalmer4

whoops, used invisible () in that first eq. :-)

20. mathcalculus

21. mathcalculus

it keeps saying it's wrong.

22. mathcalculus

i think it's the website, it must be correct. thank you everyone.

23. 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:

24. 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.

25. whpalmer4

(5,-1) that is

26. mathcalculus

yes, I checked. appreciate the help

27. mathcalculus

yup

28. mathcalculus

it must be correct, even the calculator shows it.

29. Mertsj

Maybe you want to try 9x+11y=34

30. 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.

31. whpalmer4

I'd say you know what you're doing, in any case...watch for those fraction mistakes :-)

32. mathcalculus

thanks alot ! :)

33. Mertsj

yw