Question

There is an elevator in a building that is 450 feet tall with 30 stories. Starting from the 20th floor, the elevator descends steadily toward the bottom floor, passing the 15th floor half a minute after its descent started. The graph below summarizes this information. Based on the graph, determine how fast the elevator travels and the time it would take to go from the 20th floor to the bottom of the building.

Answer 1

hmm

Answer 2

Could I help you?

Answer 3

go for it, still solving myself...

Answer 4

The idea is so simple!

It is a straight line, need to form its equation - using these two points on the graph through them it passes.

Answer 5

I know its sim....wait a minute, Im sitting here trying to graph it myself when I have the darn thing in front of me -.-

Answer 6

Ok, I got it :P If it helps, it gets to the ground at two seconds, but we dont need to know that, we need the slope. our coordinates given to us to use are (.5, 225) and (0,300) remember your slope formula??

Answer 7

By the way, no need to graph it!
Just form the line equation using this formula!

Answer 8

That's what I used :3

Answer 9

show me what you got, brother!

Answer 10

@evansanchez can you plug in your coordinates into the formula @3mar gave you??

Answer 11

whats the coordinates?

Answer 12

The two points on the graph!

Answer 13

i meant formula *

Answer 14

(0,300)
(0.5,225)

http://pasteboard.co/CcGJStsc.png
and here also

Answer 15

0, 300 / 0.5, 225 ?

Answer 16

wait

Answer 17

subtract y's and divide them by the subtraction of x's!

Answer 18

0 - 300 / 0.5 - 225

Answer 19

lemme get my total hold on

Answer 20

i got an answer of -75.5

Answer 21

why that"0 - 300 / 0.5 - 225 "?