What is the equation of the following line?

Question

anonymous · Answer

attachment

blurbendy · Answer

Same thing as last time!  Try it.

anonymous · Answer

how do you replace a #? @blurbendy

blurbendy · Answer

in an ordered pair such as (2, -8) two would be the x-value and -8 would be the y-valie

anonymous · Answer

so is it b?

anonymous · Answer

cause that is true :)

blurbendy · Answer

no, we need to involve 2 somehow

hartnn · Answer

no... you can use the alternate way i mentioned..should i mention again ?

anonymous · Answer

yeah

anonymous · Answer

how do we? @blurbendy

blurbendy · Answer

it has to be a function that has 'x' in it

hartnn · Answer

you can use the equation of line through origin as 
y=mx
since (2,-8) lies on line , plug in x=2, y=-8 to get 'm'.

blurbendy · Answer

he's basically saying what i'm saying.  a line can be represented by y = mx
y will be the result of m*x.  So, if you put 2 in for x, which constant value (or slope) will give you -8?

anonymous · Answer

so then do you divide them?

blurbendy · Answer

yes, -8 / 2 = ???

blurbendy · Answer

yup!  so which function is it?

blurbendy · Answer

good job!

hartnn · Answer

$\checkmark $

anonymous · Answer

Okay awesome! So in these problems, you just divide those #s? :)

hartnn · Answer

only if the line is passing though origin 0,0

hartnn · Answer

if the line is not passing through origin, and 2 points are given, then use the 2-point form :
$(y-y_1)=\dfrac{y_1-y_2}{x_1-x_2}(x-x_1)$

anonymous · Answer

Okay! thank u SO much! I have another one like this imma post i think i know it but i wanna make sure :)

raden_zaikaria · Answer

anwer is c