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Chapter 7
Section 7.1, Extension of Exercise 68 (page 576)
Use the elimination method to solve the system 
.
Section 7.3, Extension of Exercises 93 and 94 (page 605)
81. Let 
(a) Find the characteristic
polynomial of A.
(b) Find the graph of 
(c) Find the eigenvalues of A.
(d) Compare det A with the y-intercept of the
graph of
(e) Compare the sum of the main diagonal elements
with the sum of the eigenvalues
.
Section 7.5, Extension of Exercise 49 (page 623)
The equation
defines y as two implicit functions of x. Solve for y to find the two functions and draw the graph of the equation.