Need help ! attatchment below

Here's a graph of a linear function. Write the equation that describes that function.
express it in slope-intercept form.

Question

Need help ! attatchment below 

Here's a graph of a linear function. Write the equation that describes that function. 
express it in slope-intercept form.

anonymous · Answer

attachment

anonymous · Answer

@jigglypuff314

jigglypuff314 · Answer

slope-intercept form: y = mx + b
when m = slope and b = y-intercept

jdoe0001 · Answer

pick 2 points from the graph
notice the y-intercept comes handy
and another one, notice 6,6 could be another

anonymous · Answer

ok so the intercept is the point where it hits the y axix  
which would be y=mx+4 how wouldi  get the slop

jigglypuff314 · Answer

slope = rise over run
aka  how much it goes up  vs how much it goes to the right

anonymous · Answer

ok can you explain how i'd get that ?

jigglypuff314 · Answer

mmm  as  jdoe0001 had said, there is a point  (6, 6)
and you know there's another point at  (0, 4)
$$slope = \frac{ rise }{ run } = \frac{ y _{2}-y _{1} }{ x _{2}-x _{1} } = \frac{ 6-4 }{ 6-0 } =$$

anonymous · Answer

so it'd be like 0.33

jigglypuff314 · Answer

yep :)
and as a fraction it would be  1/3
so  m = 1/3

anonymous · Answer

y=1/3x+4?

jigglypuff314 · Answer

yep! :D

anonymous · Answer

thanks (: Graph the equation below by plotting the y-intercept and a second point on the line. 
y=2/3x-4

anonymous · Answer

ok so y=mx+b
m=2/3 
y= -4

jigglypuff314 · Answer

yep!
so you would have a point at the y-intercept
|dw:1391809717627:dw|

jigglypuff314 · Answer

then a slope of 2/3 means that from a point
you move  up 2  and  right 3 to get the next point

anonymous · Answer

never mind got it thanks bro

jigglypuff314 · Answer

glad I could help :)

anonymous · Answer

hey if the slope is going left to right is it negative ? like so

jigglypuff314 · Answer

yes, it would be negative :)

anonymous · Answer

ok so i got y= 6/1 - 5

anonymous · Answer

6/1x

jigglypuff314 · Answer

mmm close :)
" 5 " should be positive as the y-intercept is above the x axis
and you might want to recheck your slope :)

anonymous · Answer

i thought sinceit was left to right the equation was subtraction ?

anonymous · Answer

and how do you do rise over run if it's negative , i just went to the left

jigglypuff314 · Answer

subtraction like  y = -x

jigglypuff314 · Answer

mmm
slope for this would be  every time you go right one
the line goes down 5
so slope = -5

so you get   y = -5x + b

anonymous · Answer

ohh ok so y= -5x + 5 ?

jigglypuff314 · Answer

yep :)

anonymous · Answer

thank you sir (:

jigglypuff314 · Answer

you're welcome ;) (and I'm a girl, just saying XD )