\begin{array} { l } { \text { Form two simultaneous equations from the } } \\ { \text { given determinants and solve. (3 marks each) } } \\ { \text { (i) } \left| \begin{array} { c c } { 3 } & { y } \\ { 4 } & { x } \end{array} \right| = 18 \text { and } \left| \begin{array} { c c } { y } & { x } \\ { 2 } & { - 1 } \end{array} \right| = - 1 } \end{array}

\begin{array} { l } { \text { Form two simultaneous equations from the

1.	\begin{array} { l } { \text { Form two simultaneous equations from the } } \\ { \text { given determinants and solve. (3 marks each) } } \\ { \text { (i) } \left\| \begin{array} { c c } { 3 } & { y } \\ { 4 } & { x } \end{array} \right\| = 18 \text { and } \left\| \begin{array} { c c } { y } & { x } \\ { 2 } & { - 1 } \end{array} \right\| = - 1 } \end{array}
Answer» 3x-4y=18-y-2x=-12x+y=13x-4y+8x+4y=18+4=2211x=22so x=24+y=1so y=-3