Systems of Equations and Inequalities

Question 1

7.2 Example 2: Find a solution to the following system:
x - 2y + 3z = 9 (1)
-x + 3y - z = -6 (2)
2x - 5y + 5z = 17 (3)

Answer 1

(1,-1,2) (p.713)

Question 2

CA 7.2 Example 3: , Jordi invested his inheritance of $12,000 in three different funds: part in a money-market fund paying 3% interest annually; part in municipal bonds paying 4% annually; and the rest in mutual funds paying 7% annually. Jordi invested $4,000 more in mutual funds than he invested in municipal bonds. The total interest earned in one year was $670. How much did he invest in each type of fund?

Answer 2

Jordi invested $2,000 in a money-market fund, $3,000 in municipal bonds, and $7,000 in mutual funds. (p.714)