BuyFind

Single Variable Calculus: Concepts...

4th Edition
James Stewart
Publisher: Cengage Learning
ISBN: 9781337687805
BuyFind

Single Variable Calculus: Concepts...

4th Edition
James Stewart
Publisher: Cengage Learning
ISBN: 9781337687805

Solutions

Chapter 1, Problem 31RE

(a)

To determine

To find: The sketch for the curve represented by the parametric equations and then indicate the direction in which the curve is traced as the value of t increases.

Expert Solution

Explanation of Solution

Given:

The given parametric equations is x=et and y=t .

The range of the parameter t is 0t1 .

Calculation:

Consider the given parametric equations are,

  x=ety=t

The table for the value of x and y for different value of the parameter is shown in Table 1

Table 1

    txy
    0 1 0
    1 2.718281828 1
    2 7.389056099 1.414213562
    3 20.08553692 1.732050808
    4 54.59815003 2
    5 148.413591 2.236067977
    6 403.4284935 2.44945743

The plot for the above points on the coordinate plane is shown in Figure 1

  Single Variable Calculus: Concepts and Contexts, Enhanced Edition, Chapter 1, Problem 31RE

Figure 1

(b)

To determine

To find: The Cartesian equation of the curve.

Expert Solution

Answer to Problem 31RE

The required Cartesian equation is y=lnx .

Explanation of Solution

Given:

The given parametric equations is x=et and y=t .

The range of the parameter t is 0t1 .

Calculation:

Consider the given parametric equations are,

  x=ety=t

Take natural log on both the sides for the equation x=et as,

  lnx=lnetlnx=t

Consider the equation y=t as,

  y=lnx

Thus, the required Cartesian equation is y=lnx .

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