1. Решите систему уравнений по формулам Крамераи сделать проверку решения. \[ \left\{\begin{array}{l}k x_{1}+x_{2}+3 x_{3}=-2 \\ 3 x_{1}+2 x_{2}+2 x_{3}=1 \\ 2 x_{1}-3 x_{2}-x_{3}=3\end{array}\right. \] (k-номер по журналу).

16. \( A B C \) is a right triangle at \( A \) such that \( A B=2 \mathrm{~cm} \) and \( A C=\sqrt{3} \mathrm{~cm} \). Calculate the exact value of \( B C \) then give an approximate value of \( B C \) to the nearest \( 10^{-2} \) by default.

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\( Y=x^{2}+2 x-3 \), find the value of \( x \) when \( y=0 \)

14. Welche Winkel bildet ä mit den Koordinatenachsen ? \( \begin{array}{lll}\text { a) } \overrightarrow{\mathrm{a}}=\binom{4}{-3} & \text { b) } \overrightarrow{\mathrm{a}}=\left(\begin{array}{c}4 \\ -2 \\ 1\end{array}\right) & \text { c) } \overrightarrow{\mathrm{a}}=\left(\begin{array}{c}-7 \\ 0 \\ 5\end{array}\right)\end{array} \)

1.ve graphically the systems of linear inequalities belo dicate the coordinates of the extreme points. \( \left\{\begin{array}{c}3 x+4 y \leq 12 \\ 2 x+4 y \leq 8 \\ x \geq 0 \\ y \geq 0\end{array}\right. \) 2. \( \left\{\begin{array}{c}4 x+4 y \geq 16 \\ 5 x+3 y \leq 15 \\ x \geq 0 \\ y \geq 0\end{array}\right. \)