91Ó°ÊÓ

In Exercises 13 - 30, solve the system by the method of elimination and check any solutions algebraically. \( \left\\{\begin{array}{l}0.05x - 0.03y = 0.21\\\0.07x + 0.02y = 0.16\end{array}\right. \)

In Exercises 21 - 34, solve the system by the method of substitution. \( \left\\{\begin{array}{l}0.5x + 3.2y = 9.0\\\0.2x - 1.6y = -3.6\end{array}\right. \)

In Exercises 13 - 30, solve the system by the method of elimination and check any solutions algebraically. \( \left\\{\begin{array}{l}4b + 3m = 3\\\3b + 11m = 13\end{array}\right. \)

In Exercises 19 - 44, solve the system of linear equations and check any solution algebraically. \( \left\\{\begin{array}{l}3x - 5y + 5z = 1\\\5x - 2y + 3z = 0\\\7x - y + 3z = 0\end{array}\right. \)

In Exercises 21 - 34, solve the system by the method of substitution. \( \left\\{\begin{array}{l}\dfrac{1}{5}x + \dfrac{1}{2}y = 8\\\x + y = 20\end{array}\right. \)

In Exercises 21-32, use a graphing utility to graph the inequality. \( y < \- 3.8x + 1.1 \)

In Exercises 19-42, write the partial fraction decomposition of the rational expression. Check your result algebraically. \( \dfrac{x^2 + 12x + 12}{x^3 - 4x} \)

In Exercises 21-32, use a graphing utility to graph the inequality. \( y \ge -20.74 + 2.66x \)

In Exercises 13 - 30, solve the system by the method of elimination and check any solutions algebraically. \( \left\\{\begin{array}{l}2x + 5y = 8\\\5x + 8y = 10\end{array}\right. \)

In Exercises 21 - 34, solve the system by the method of substitution. \( \left\\{\begin{array}{l}\dfrac{1}{2}x + \dfrac{3}{4}y = 10\\\\\dfrac{3}{4}x - y = 4\end{array}\right. \)