Question 303783
{{{y = sqrt(x)/5}}}
y' = {{{(1/2)x^(-1/2)/5}}}
y' = {{{1/(10sqrt(x))}}}
At x = 4, y = 2/5, y' = 1/20 = m
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2/5 = (1/20)*4 + b
b = 1/5
--> y = (1/20)x + 1/5