1. Which expression is equivalent to \( \frac{9 x^{-4} y^{10} z^{-6}}{36 x^{-3} y^{5} z^{6}} \) ? \( \begin{array}{ll}\text { A. } \frac{y^{5}}{4 x z^{12}} & \text { c. } \frac{x y^{5}}{27} \\ \text { B. } 4 x^{7} y^{15} & \text { D. } \frac{4 y^{5}}{x^{7} z^{12}}\end{array} \)

\( \left. \begin{array} { r l r l } { 5 x + 3 x + 2 x } & { = } & { 7 y + 5 y - 9 y } & { = } \\ { 2 a + 4 a + 6 a } & { = } & { 2 a + 3 a - 5 a } & { = } \\ { 3 x + 5 x - 6 x } & { = } & { 10 x - 5 x + 12 x } & { = } \\ { - 5 y - 8 y } & { = } & { - 11 b - 7 b } & { = } \end{array} \right. \)

Simplify. \[ \frac{a^{5} b}{a^{4} b^{7}} \]

Graph the solution set of the following system of inequalities. \[ \begin{array}{l}x+y \leq 4 \\ y \geq x^{2}-3\end{array} \]

Which of the following equations represents a line that passes through the points \( (8,2) \) and \( (-4,-7) \) ? I. \( y-2=\frac{3}{4}(x-8) \) II. \( 3 x-4 y=16 \) Answer Neither II only

Resolver \( \left\{\begin{aligned} x+2 y+z & =4 \\ 3 x+z & =2 \\ x-y+z & =7\end{aligned}\right. \)