(1) x:y:z=∣−2−132∣:∣−1122∣:∣1−223∣=−4+3:−2−2:3+4=−1:−4:7=1:4:−7x:y:z = \begin{vmatrix} -2 & -1 \\ 3 & 2 \end{vmatrix} : \begin{vmatrix} -1 & 1 \\ 2 & 2 \end{vmatrix} : \begin{vmatrix} 1 & -2 \\ 2 & 3 \end{vmatrix} = -4+3:-2-2:3+4 = -1:-4:7 = 1:4:-7x:y:z=−23−12:−1212:12−23=−4+3:−2−2:3+4=−1:−4:7=1:4:−7 (2) x:y:z=∣11−20∣:∣1130∣:∣113−2∣=2:−3:−2−3=2:−3:−5x:y:z = \begin{vmatrix} 1 & 1 \\ -2 & 0 \end{vmatrix} : \begin{vmatrix} 1 & 1 \\ 3 & 0 \end{vmatrix} : \begin{vmatrix} 1 & 1 \\ 3 & -2 \end{vmatrix} = 2:-3:-2-3 = 2:-3:-5x:y:z=1−210:1310:131−2=2:−3:−2−3=2:−3:−5