Question

PLS HELP??

During a science experiment, Faye recorded the temperature of a solution as it cooled in a controlled environment for 6 minutes. She graphed the change in temperature as shown below.

If the solution continues to cool at the same rate, how many minutes will it take for the temperature to cool to 0°C?

A. 24

B. 19

C. 14

D. 9

Answer 1

can u find the equation of that line?
by selecting any two points on that line.....

Answer 2

Uhhh...ok so it would be the points (0, 40) and (6, 30) and m = y2- y1/x2 - x1, so m = 40 - 30 / 0 - 6 ?

Answer 3

am i correct?

Answer 4

yup,correct :) go ahead...

Answer 5

yup,correct :) go ahead...

Answer 6

ok so m = - 10/6
y - 30 = - 10/6 (x - 40)
y - 30 = - 10/6 x - 40
+ 40 + 40

so would the answer be y = - 10/6 x + 80
?

Answer 7

wait omg im so confused im sorry im dumb

Answer 8

y - 40 = - 10/6 (x - 0)
as the point (x1,y1) is (0,40)
got this?

Answer 9

yes ok then
y - 40 = - 10/6 (x - 0)
y - 40 = - 10/6 x - 0
+ 0 + 0
y = - 10/6 x + 0

????

Answer 10

y - 40 = - 10/6 x - 0
adding 40 on both sides will give u
y=-10/6x+40
ok?

Answer 11

ohhh ok i was supposed to add 40 lol ok that makes alot more since

Answer 12

or u can keep that as y - 40 = - 10/6 x
now to get temperature 0, u put y=0 in that,to solve for x.....
can u ?

Answer 13

ahh im really confused on how to do this...wouldnt it just be the same thing if
0 - 40 = - 10/6 x
40 = - 10/6 x
??

Answer 14

when u multiply by -1
-40*-1 = 40,thats correct
but,
- 10/6 x *(-1)=10/6 x
so u should have 40=10/6 x
now can u find x?

Answer 15

sorry im actually really sorry lol omg im still really confused on how to find x ..

Answer 16

but u clear till 40=10/6x right?
so dividing by 10 u get
4=(1/6)x
and multiplying by 6 gives
x=6*4= ??

Answer 17

24
yeah oh oh my god ok thank u soooooooo much wow it makes soooo much more since now. thank u!!!!!!!!!!

Answer 18

welcome :)

Answer 19

24