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Find the equation of the tangent line to the graph of f(x)=4ln(9x+2)at the point of x-coordinate x=2.

slope = y'=4/(9x+2) * 9

at x=2, y'=36/(20= 1.8 check that.

y= mx+b= 1.8 x+ b
put in x,y, solve for b.

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