Given the system of equations! \( \left\{\begin{array}{l}2 x-3 y-9 z=6 \\ x+3 z=-6 \\ -3 x+y-4 z=12\end{array}\right. \) (a) Determine the type of system: O dependent inconsistent (b) If your answer is dependent in (a), find the complete solution. Write \( x, y \) as functions of \( z \). If your answer is inconsistent, write DNE for all three variables. \( x=\square \) \( y=\square \) \( z=\square \)

(ס) \( \frac{4(a-9)}{36(9-a) x^{3}} \)

(12) If \( 4 n \geq 9 \), what is the least possible value of \( 4 n+1 ? \)

Simplify the following expressions fully: \( 1.2 .1 \quad(x+2)\left(x^{2}-x+3\right) \)

FACTORIZAR APLICANDO CASOS COMBINADOS DE FACTDRES A) \( \cdot x^{3}+5 x^{2}-4 x-20 \) B) \( \cdot 75 x^{5}+60 x^{4}+12 x^{3} \) C) \( \cdot 2 x^{2}-18 \) d) \( x^{3}+x^{2}-9 x-9 \) e) \( x^{4}-81 \)

Jika \( \left(\begin{array}{cc}-2 & 2 \\ 5 & y\end{array}\right)\left(\begin{array}{ll}5 & 3 \\ x & 4\end{array}\right)=\left(\begin{array}{cc}-6 & 2 \\ 27 & 19\end{array}\right) \), cari nilai \( x \) dan \( y \). If \( \left(\begin{array}{cc}-2 & 2 \\ 5 & y\end{array}\right)\left(\begin{array}{ll}5 & 3 \\ x & 4\end{array}\right)=\left(\begin{array}{cc}-6 & 2 \\ 27 & 19\end{array}\right) \), find the value of \( x \) and \( y \).