I will give a medal and fan, please help :)
Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y = –9x – 9. A perpendicular brace passes through the point (–1, 7). Write an equation of the line that contains the brace.
y – 1 = –(x + 7)
x – 7 = –9(y + 1)
y – 7 = (x + 1)
y – 7 = –9(x + 1)

Question

I will give a medal and fan, please help :)
Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y = –9x – 9. A perpendicular brace passes through the point (–1, 7). Write an equation of the line that contains the brace.  
y – 1 = –(x + 7)
x – 7 = –9(y + 1)
y – 7 = (x + 1)
y – 7 = –9(x + 1)

anonymous · Answer

ok well we know the slope of the first line correct

anonymous · Answer

Thats the y = -9x - 9?

anonymous · Answer

Or is it the -1,7?

anonymous · Answer

they really stretch for these word problems, don't they?

anonymous · Answer

y=mx+b where m is the slope

anonymous · Answer

slope of $y=mx+b$ is $m$
what is the slope of $y=-9x-9$ ?

anonymous · Answer

usually lol

anonymous · Answer

Yes they do @satellite73 I think thats what confuses me so much.

anonymous · Answer

So the slope is -9.

anonymous · Answer

yes

anonymous · Answer

correct, now we need to find the inverse

anonymous · Answer

now how about a perpendicular line. what slope will that have?

anonymous · Answer

What is the inverse? And Im not sure what a perpindicular line would have.

anonymous · Answer

if the slope of one line is $m$ then the slope of a perpendicular line will be $-\frac{1}{m}$ in english "negative reciprocal"

anonymous · Answer

so the negative reciprocal of $-9$ is ...

anonymous · Answer

-1 over -9

anonymous · Answer

lol @satellite73 dont you have enough medals, and fans?

anonymous · Answer

yup

anonymous · Answer

so simplified would get you what?

anonymous · Answer

actually, i don't see the answer listed above. maybe i am misinterpreting the question

anonymous · Answer

@NickR   do you see the correct answer in the list?

anonymous · Answer

Idk. I hate math :(

anonymous · Answer

now that i look at it no i dont

anonymous · Answer

looks  like all answers are supposed to be to the question "write the equation of the line parallel to $y=-9x-9$ through the point $(-1,7)$

anonymous · Answer

we all do

amistre64 · Answer

might be a typo

anonymous · Answer

@amistre hi
am i missing something?

anonymous · Answer

besides my hair i mean

anonymous · Answer

well either way a is out can tell you that

anonymous · Answer

WAIT. It didnt copy and paste right. The first answer says * -1 over -9  and 3rd answer says 1 over 9

amistre64 · Answer

$$y -7= \frac19(x+1)$$
$$9(y -7)= x+1$$

anonymous · Answer

go with C, it is almost always C (all but a set of measure zero)

anonymous · Answer

working through this i got y-7 = 1/9 (x+1)

anonymous · Answer

That means its c. Because after I corrected my typo thats what c is?

anonymous · Answer

ok glad we could help

anonymous · Answer

> It didnt copy and paste right.

anonymous · Answer

Thank you everyone, seriously. And sorry about my typo!

anonymous · Answer

all good not your fault