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Author Question: How do I rearrange the y=mx+b equation to find the unknown value of X on my graph? (Read 2471 times)

luvbio

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on: Oct 4, 2013
I am using the formula y=mx+b on a graph, I am trying to find the values of 3 unknown concentrations of DNA on the X axis, how do I rearrange this equation so I can find these hidden values? My straight line equation is y=0.0006x + 0.0247 any help would be great! Thanks.


Yolanda

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Reply #1 on: Oct 4, 2013
y = mx + b
y - b = mx
x = (y - b) / m
y = 0.0006x + 0.0247
y - 0.0247 = 0.0006x
x = (y - 0.0247) / 0.0006


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federox

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Reply #2 on: Oct 4, 2013
(y-b)/m=x

so

(y-0.0247)/0.0006=x


sadsdas

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Reply #3 on: Oct 4, 2013
subtract b
then divide by m

y=mx+b
y - b =mx
(y-b)/m = x


geoffrey

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Reply #4 on: Oct 4, 2013
x =    -41.1667 + 1666.67 y


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