Question

Find the slope of a line passing through the points (1980,19000) and (2000,4000) help PLEASE

Answer 1

shoot typo, it should read (1980,19000) and (2000,41000) NOT (4000)

Answer 2

Subtract the y coordinates: 41000 - 19000 = 22000

Answer 3

Subtract the x coordinates (in the same order). Tell me what you get.

Answer 4

20

Answer 5

is the x coordinates?

Answer 6

no, it's the change in y over change in x

Answer 7

slope = (difference in y coordinates)/(difference in x coordinates)

slope = (22000)/(20)

slope = 1100

Answer 8

OH! I see, and then I multiply 1100 by 20 which gave me 22,000 and add that to my 41000 which gives me a median family increase to 63000 in year 2005.

Answer 9

No, you found the slope to be m = 1100

Answer 10

i'm confused

Answer 11

now use this in

y = mx+b

along with x = 1980 and y = 19000 to find b

Answer 12

first year algebra, forgive me, can you help me walk through it without giving me the answer?

Answer 13

y = mx+b

y = 1100x + b

19000 = 1100*1980 + b

Now solve for b

Answer 14

Does that make sense?

Answer 15

2178000 when i multiply 1100*1980.

Answer 16

good so far, what's next?

Answer 17

2159000 is b?

Answer 18

think i'm doing it right

Answer 19

it's negative though

Answer 20

since 19000 - 2178000 = -2159000

Answer 21

so

y = mx+b

becomes

y = 1100x - 2159000

Answer 22

so in 2005, the median income is...

y = 1100x - 2159000

y = 1100(2005) - 2159000

Keep going to get the answer

Answer 23

46500

Answer 24

thanks Jim. Let me know how I did. :)

Answer 25

that's it, you nailed it

Answer 26

You rule! Thank you. :)

Answer 27

you're welcome