The point P(5, −4) lies on the curve y = 4/(4 − x). If Q is the point (x, 4/(4 − x)), use your calculator to find the slope mPQ of the secant line PQ (correct to six decimal places) for the following values of x.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 94E
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The point P(5, −4) lies on the curve y = 4/(4 − x). If Q is the point (x, 4/(4 − x)), use your calculator to find the slope mPQ of the secant line PQ (correct to six decimal places) for the following values of x.

(i)    4.9
mPQ =  


(ii)    4.99
mPQ =  


(iii)    4.999
mPQ =  


(iv)    4.9999
mPQ =  


(v)    5.1
mPQ =  


(vi)    5.01
mPQ =  


(vii)    5.001
mPQ =  


(viii)    5.0001
mPQ =  

(b) Using the results of part (a), guess the value of the slope m of the tangent line to the curve at P(5, −4).

m =  


(c) Using the slope from part (b), find an equation of the tangent line to the curve at P(5, −4).
 
y = 
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