
(a)
To check: The graph of the equation
(a)

Answer to Problem 18E
The graph of the equation
Explanation of Solution
Given information:
The given equation is
Calculation:
Write the standard equation for the graph when the graph is degenerated.
Compare the given equation with the standard equation of the graph.
Calculate the discriminant.
Since, the discriminant is less than 0. So, the graph of the equation will be an ellipse.
Therefore, the graph of the equation
(b)
To find: The equation by eliminating the
(b)

Answer to Problem 18E
The equation is
Explanation of Solution
Given information:
The given equation is
Calculation:
Write the standard equation for the graph when the graph is degenerated.
Compare the given equation with the standard equation of the graph.
Write the equation for an angle through which axes are rotated.
Substitute the values in the above equation.
Calculate the value of
and,
Write the equation for the rotation of axes.
and,
Substitute the value of
Further, simplify.
On expanding and simplifying.
Therefore, the equation is
(c)
To plot: The graph of the equation
(c)

Explanation of Solution
Given information:
The given equation is
Graph:
The graph of the equation is given below.
Interpretation:
The ellipse has center at the origin and vertex at
Chapter 11 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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