## 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 Group Title

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 Group Title

i did..

3. whpalmer4 Group Title

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

4. mathcalculus Group Title

can you point it out where?

5. Mertsj Group Title

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

6. Mertsj Group Title

Simplify and you will be done.

7. mathcalculus Group Title

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

8. whpalmer4 Group Title

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

9. mathcalculus Group Title

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

10. whpalmer4 Group Title

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

11. Mertsj Group Title

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

12. mathcalculus Group Title

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

13. mathcalculus Group Title

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

14. mathcalculus Group Title

oh yes! got it

15. mathcalculus Group Title

damn

16. mathcalculus Group Title

9/11 * 5

17. Mertsj Group Title

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

18. whpalmer4 Group Title

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 Group Title

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

20. mathcalculus Group Title

21. mathcalculus Group Title

it keeps saying it's wrong.

22. mathcalculus Group Title

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

23. whpalmer4 Group Title

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 Group Title

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 Group Title

(5,-1) that is

26. mathcalculus Group Title

yes, I checked. appreciate the help

27. mathcalculus Group Title

yup

28. mathcalculus Group Title

it must be correct, even the calculator shows it.

29. Mertsj Group Title

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

30. whpalmer4 Group Title

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 Group Title

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

32. mathcalculus Group Title

thanks alot ! :)

33. Mertsj Group Title

yw