I Need help figuring this one out...not sure where to start with it.

Find the equation of a horizontal line that contains (-6,8)

Question

I Need help figuring this one out...not sure where to start with it.




Find the equation of a horizontal line that contains (-6,8)

hartnn · Answer

Equation of horizontal line is in the form of y=c
what is y-co-ordinate in (-6,8) ?

hartnn · Answer

your name is awesome! and funny :P

anonymous · Answer

8 right?

anonymous · Answer

haha thanks

hartnn · Answer

right! 
so the equation of horizontal line will be y=8
because (-6,8) has to lie on it.

anonymous · Answer

this is what it says under the question... does it still make it y=8?

anonymous · Answer

Think about what the slope is of a horizontal line and use that slope and the point and place into point-slope and then transform to slope-intercept form.

hartnn · Answer

OMG! ok, 
what do u think is the slope of horizontal line is ?

anonymous · Answer

zero slope

anonymous · Answer

so i do 0x +8y=

hartnn · Answer

it said ' place into point-slope'
so, put m=0 in y-y1= m(x-x1)

anonymous · Answer

oh i am still figuring out the slope formulas. my final exam is today and im still really lost on this stuff! :(

hartnn · Answer

slope = m = 0 is correct.
just put it in  y-y1= m(x-x1)
what u get ?

anonymous · Answer

i got y=-6

hartnn · Answer

y-y1 = 0(x-x1)
y-y1=0
ok?

hartnn · Answer

now put point (x1,y1) = (-6,8)
so put y1=8 in that

anonymous · Answer

right... i did y--6=0(x--8) which comes out to be y+6=0 so subtract 6 from both sides and y=-6 right? or no?

hartnn · Answer

x1=6, y1=8
not the other way round

anonymous · Answer

oooops!!!!! okay ill do it again

anonymous · Answer

so y=8

hartnn · Answer

yes

anonymous · Answer

haha so why did i have to do all that if i know what each coordinate is? shes just making us do extra work or what?

hartnn · Answer

she's giving u a particular way to solve, what i did in 1st comment was a shortcut., never do that.

anonymous · Answer

oh okay. you are so awesome, thank you!! :)

hartnn · Answer

lol, welcome ^_^

anonymous · Answer

how do i fugire this one out? same kinda thing but with x?

anonymous · Answer

Find the equation of a vertical line that contains (-9,4)
Think about what the slope is of a vertical line and if the equation will start with x or y=

hartnn · Answer

vertical line slope = ?

anonymous · Answer

i dont know... -9?

anonymous · Answer

undefined

hartnn · Answer

un defined, so the equation is in the form of x=c

hartnn · Answer

whats x-cordinate ?