SOLUTION: I have some graphs that have lines put onto them and our teacher wants us to put them into linear equations. how do i do it? please help.

Algebra ->  Linear-equations -> SOLUTION: I have some graphs that have lines put onto them and our teacher wants us to put them into linear equations. how do i do it? please help.      Log On


   



Question 369141: I have some graphs that have lines put onto them and our teacher wants us to put them into linear equations. how do i do it? please help.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Find two points from the graph.
We'll call them (x%5B1%5D,y%5B1%5D) and (x%5B2%5D,y%5B2%5D).
Calculate the slope.
m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29
Then use the point-slope form of a line,
y-y%5Bp%5D=m%28x-x%5Bp%5D%29
with either point.
y-y%5B1%5D=m%28x-x%5B1%5D%29
.
.
.
highlight%28y=mx-mx%5B1%5D%2By%5B1%5D%29