Question

In 1980 Median family income was about $19,000 and in 2000 it was about $43,000. Find the slope of the line passing through points (1980,19000) and (2000,43000). Interpret the slope as a rate change. What will the median family income be in 2007?

Answer 1

y2-y1 over x2-x1 is slope

Answer 2

Can you please help me solve this?

Answer 3

okay so do (43000-19000)/(2000-1980) to get slope

use y-y1=m(x-x1) to find the equation (solve for y)

plug in your new x

Answer 4

m=24000/20
=1200

Answer 5

The family income increases by $1200 between 1980 and 2000.
Right?

Answer 6

each year it increases that much

Answer 7

So the change is..... the family income is increasing at the rate of $1200 per year

Answer 8

yea

Answer 9

What will be the family median income in 2007?

Answer 10

pick a set of coordinates to be your (x1,y1)
plug into y-y1=m(x-x1)

to get something in the form of y=mx+b

plug in 2007 for the x in your new equation

Answer 11

If the trend continues, estimate the family median in 2007.
Do I use the same equation? Instead of using 2000-1980. use 2007-1980

Answer 12

standby

Answer 13

ok

Answer 14

http://imgur.com/OzsZu

Answer 15

solve the bottom

Answer 16

the answer I got was 51,400

Answer 17

yup

Answer 18

Find the slope, if it exists, of the line containing the pair of points.
(-15,-4) and (-17,-12)

The slope is?
The slope is undefined?
Please help me solve this

Answer 19

same thing as before

Answer 20

m=-12-(-4)/-17-(-15)
=16/32

Answer 21

m=2/4

Answer 22

right?

Answer 23

the slope is 2/4

Answer 24

Am I correct?