Question

Suppose that a certain strain of pea plant requires 14 days to reach a height of 6 inches and 30 days to reach a height of 16 inches. How many days would it take a plant of this strain to reach a height of 12 inches? * i got 15 days, am i right? *

Answer 1

Let's just check with the steps,

Did you get m ?

Answer 2

m?

Answer 3

the slope :)

Answer 4

ohh, noo i just cross multiplied and divided (:

Answer 5

It's okay, you must find the slope to find the equation of the line :)

m = y2-y2/x2-x1

after that, choose any of the given points to plug in the following equation :

y - yo= m(x-xo) :)

Answer 6

oh wait a min, wasn't the question find the linear equation?.-.

Answer 7

noo (:

Answer 8

oh dear, but you wrote that in the previous one >_< lol

Answer 9

the other one was, but not this one lol

Answer 10

oh okay, then you have to use the equation you got in the previous question then plug in x to find y :) since we said that

y = height
x = number of days

when you plug in x, you'll get y, that's it ^_^

Answer 11

wait what

Answer 12

so you have an equation in the form of :

y = mx + B <-- from the previous question

plug in y = 12, to get x = number of days ^_^

Answer 13

what what? ._.

Answer 14

ohh dont worry, I guess that the question forgot to put "assume a linear eqn "

Answer 15

lol , anyhow, did you understand what you have to do now bailey ? ^_^

Answer 16

because otherwise you would assume expxonential growth , but im assuming the asker hasnt done that yet :P

Answer 17

>_> :P

Answer 18

do you know what to do now bailey? :)

Answer 19

kind of (:

Answer 20

:) not convincing me here lol

Alright, did you find the equation from the previous question? :)

Answer 21

from this question i got y=x+12

Answer 22

:)

Answer 23

alright, now we said that x = represents the number of days right? and y =height, right?

Answer 24

yepp!

Answer 25

alright then, the question wants to know how many days would it take a plant to reach 12 inches right?

so in this case y = 12, all you'vegot to do is plug it in the equation and find x^_^

Answer 26

got it? :)

Answer 27

so to find x, what would i have to do, combine like trems? or no.

Answer 28

nope you have :

y = x + 12 where x = days and y = height = 12

12 = x + 12
x = 0....hmm there's something wrong, are you sure of your equation?

Answer 29

no :/

Answer 30

(14,6) ( 30,16)

m = (16-6) / (30-14) = (5/8)

Answer 31

m = y2-y1/x2-x1
m = (16-6)/(30 - 14)
m = 0.625

Answer 32

taake the first point

Answer 33

y-6 = (5/8) ( x-14)

Answer 34

so it's y=5/8x+12??????????

Answer 35

y= (5/8)x -(11/4)

Answer 36

now plug this in the following :

y - yo= m(x-xo) <-- choose any point:
y - 12 = 0.625(x-30)
y = 0.625x - 6.75

Answer 37

we are both wrong I think

Answer 38

that is your equation, now plug in the 12 inches to find the number of days :

12 = 0.625x - 6.75
0.625x = 18.75
x = 30

So it takes 30 days? .-. LOL there's something wrong >_<?

Answer 39

IKR i couldnt find the answer either

Answer 40

what are we missing o_o?

Answer 41

wait


I am right :P

Answer 42

IDK (: lol

Answer 43

y= (5/8)x -(11/4)

Answer 44

are you sure x = represents the number of days?, oh so my answer is true? LOL

Answer 45

^ thats right

Answer 46

same thing, but mine is in decimal lol, but wait 11/4?

Answer 47

12 = (5/8)x -11/4
(5/8)x = 14.75
x= (8/5) * 14.75 = 23.6 days

Answer 48

which makes sense, its half way between 14 and 30

Answer 49

about

Answer 50

oh right >_< I've put 12 insteadof 16, sorry sorry , thank you elec ^_^"

Answer 51

I always miss something o_o, my apologies ^_^

Answer 52

thanks darlings, your AMAZING (: