i need someone to walk me through this as well: write the point-slope form of the equation of the line through the given point with the given slope... through: (4,4)... slope= undefined

Question

aroub · Answer

ok sure..

aroub · Answer

ok if u have an undefined slope then the line is vertical

anonymous · Answer

which means?

aroub · Answer

which means if u have a vertical line the equation looks like x= ? (something)

anonymous · Answer

so... would the slope be 0? or do you mean it could be anything?

anonymous · Answer

The slope is not 0, it's undefined. It's a vertical line

aroub · Answer

no in there is no slope its undefined..

anonymous · Answer

sorry, I'm kinda young i don't get this at all...

aroub · Answer

well let polpak explain it to u ..

anonymous · Answer

okay, thanks for helping aroub :)

anonymous · Answer

If the slope is undefined the equation will look like:

x = a

If the slope 0 the equation will look like:

y = a

anonymous · Answer

where a is the x or y part of the point they give you.

anonymous · Answer

oh! i get it, a vertical line is on the x-axis! duh! thanks

anonymous · Answer

is that right?

anonymous · Answer

It goes through the x axis

anonymous · Answer

It is parallel to the y axis

anonymous · Answer

So they gave you the point (4,4) and the slope is undefined.

anonymous · Answer

So what will the equation look like?

anonymous · Answer

yes

anonymous · Answer

um... i have y-4=m(a-4)....????

anonymous · Answer

thats probably wrong

anonymous · Answer

Nope, remember what the equation is when the slope is undefined.

It's different than the usual point-slope form

anonymous · Answer

That would be right for any slope except undefined.

anonymous · Answer

4=a?

anonymous · Answer

im not getting this..

anonymous · Answer

x=4

anonymous · Answer

a is the x part of the point(4,4)

anonymous · Answer

i have the answers at the back of the packet I'm doing them in, but it says the answer is 0= x-4

anonymous · Answer

undefined slope form is:

x = a

where a is the x part of the point they give you.

anonymous · Answer

how does it come to that?

anonymous · Answer

That's the same answer.

anonymous · Answer

Just a dumber form.

anonymous · Answer

where did the 0 come from?

anonymous · Answer

If you take my equation, and subtract 4 from both sides..

anonymous · Answer

oh.. and why would i need to do that?

anonymous · Answer

because some people are silly and think that way looks better.

anonymous · Answer

okay, i guess i have a stupid school math department then... thanks soooooo much for your help polpak!!!!! :D

anonymous · Answer

No problem