Solve the following system of equations by triangularization: \( \left\{\begin{array}{l}3 x+3 y-3 z=24 \\ -3 x-4 y-6 z=23 \\ 3 x-3 y+2 z=11\end{array}\right. \) \( (x, y, z)=\square \)

Which of the following equations represents a line that passes through the points \( (-4,11) \) and \( (6,-9) \) ? \[ \begin{array}{l}\text { I. } y=-2 x+3 \\ \text { II. } y+9=-2(x-9) \\ \text { Answer } \\ \text { Neither } \\ \text { II only }\end{array} \] I only I II

Simplify the expression: \( 3 z-6+7-3 z+9 \)

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

Simplify. \[ \frac{x^{2} y^{6}}{x^{3} y^{6}} \]

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