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March 31, 2015

March 31, 2015

Posted by **kim** on Friday, March 8, 2013 at 10:27pm.

f(x)=x^2/x+4 ;(1,1/5)

m =??

y =??

- math -
**Damon**, Friday, March 8, 2013 at 10:38pmdy/dx = slope = [ (x+4)(2x) - x^2 ] /(x+4)^2

= ( x^2 + 8 x ] / (x+4)^2

at x = 1 this slope is

= 9/25 so that is m

goes through (1, 1/5)

1/5 = (9/25)(1) + b

5/25 = 9/25 + b

b = -4/25

so

y = 9 x/25 - 4/25

or

25 y = 9 x - 4

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