Question

How you write an equation of a line with a slope of -5 and a y-intercept of (0,3)? Do you use Slope-Intercept form?

Answer 1

slpe intercept will work in this case yes

Answer 2

You. Are. A. Saint. Thank you So much.

Answer 3

let me know if the video helped any

Answer 4

@amistre64 For two points, how would i go about putting it in an equation?

Answer 5

and it helped Caleb. :)

Answer 6

well it was supposed to be a video

http://dradqrf3hyj25.cloudfront.net/thumbnails/Alg1_10_1_10-diagram_thumb.png

Answer 7

Its more of an image. :P

Answer 8

i am glad it did trying ti get the video version

Answer 9

here go to this site http://www.virtualnerd.com/algebra-1/linear-equation-analysis/intercept/intercept-examples/x-y-intercepts-from-slope-intercept

Answer 10

well, if we use the slope intercept form .. y = mx+b its just a matter of filling in the parts

Answer 11

@amistre64 so say for instance you have (4,8) and (-2,6). how would you plug that in?

Answer 12

well, when we dont have a slope given to us, we determine the slope using what we like to call: the slope formula

the slope formula has a nice touch to it in that it can be reworked into the point slope eqaution of a line, which can then be worked into a slope intercept .

given 2 points (x1,y1) and (x2,y2)

y1 - y2
slope = ------
x1 - x2


now, knowing that the slope of a line is the same between any 2 points on the line, we can make one of the points general, just some (x,y) therefore

y - yo
slope = ------
x - xo

mutliply to rid the bottom


y - yo = slope(x - xo) , but slope is to wordy and we just name it a m

y - yo = m(x - xo) this is hte point slope form of a line

now, we can take this and solve for y to convert it into slope intercept form

y = m(x-xo) + yo

y = mx -mxo + yo , such that yo - mxo is the y intercept, which we rename as

y = mx + b

Answer 13

Oooh ok. I get it, thank you so much. :)