Consider the second normal equation, equation (4.18).

(a) Using the information in tables 4.1 and 4.2, verify that the solution we gave for a and b in section 4.7 satisfies the second normal equation, equation

(4.18).

(b) Using the information in table 3.3, verify that the solution we gave for a and b in section 4.7 satisfies the first and second normal equations, equations

(4.17) and (4.18).

(c) Explain how table 4.4 verifies the first normal equation for our solution of a and b in section 4.8. Using the information in tables 4.3 and 4.4, verify that the solution we gave for a and b in section 4.8 satisfies the second normal equation, equation (4.18).