Math 111, Fri, Aug 26, 2011
1.3 - Lines and slopes...
slope: change in y / change in x (rise / run)
for , up three each time I go 2 to the right (down three each time I go 2 to the left)
This line has a slope of 2...
If you write a line as , then the m is the slope.
We can find the slope of
Also note that when x=0 then and the point is the y-intercept
because of this.. is called "slope-intercept" form of the line
We call "General" form of a line
"Point-slope" form looks like:
Using this we can quickly write a line through with slope
and switch to slope intercept
You but a copier for $18,000 and it has linear depreciation for 15 years - at which time its scrap value is $3,000.
dollars per year.
47) The population of Flint, MI decreased from 124,943 in 2000 to 112,900 in 2008... Find the "average rate of change" (slope) in population over that time
people per year
We could even write an equation...
If I call 2000 the year "0"
If I leave 2000 as 2000...
A taxi costs $3 to pickup and $2 a mile.
The slope is dollars per mile.
The y-intercept is 3 dollars.