Posted by **Anonymous** on Tuesday, October 21, 2008 at 6:42pm.

a candle is a foot tall after burning an hour. after 4 h it is 10.5 in. tall. write a linear equation to model the height y of the candle after x hours. and how many hours will the candle be 6 inches tall??

plz explain the work .....

- math -
**alisha**, Tuesday, October 21, 2008 at 6:43pm
plz...help

- alisha -
**Reiny**, Tuesday, October 21, 2008 at 6:56pm
look at it as ordered pairs of the form

(time, height)

you are given 2 such points, namely

(1,12) and (4,10.5)

slope = (10.5+12)/(4-1)

= -1.5/3 = -.5 or =1/2

using height = m(time) + b (remember y=mx+b ?)

and using the point (1,12)

we get

12 = -(1/2)(1) + b

b = 12.5

so height = -time/2 + 12.5

you want height to be 6

6 = -time/2 + 12.5

12 = -time + 25

time = 25-12

= 13

- alisha -
**Anonymous**, Tuesday, October 21, 2008 at 7:06pm
thanks so so so much

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