Algebra Archive: Questions from May 18, 2023
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Solve the system of equations using substitution. \[ \left\{\begin{array}{r} x^{2}+y^{2}=145 \\ x-y=17 \end{array}\right. \] A. \( x=8, y=-9 ; x=9, y=-8 \) or \( (8,-9),(9,-8) \) B. \( x=-8, y=-9 ; x=2 answers -
Multiply \( \left[\begin{array}{cc}-1 & 0 \\ 7 & 2 \\ -3 & 5\end{array}\right]\left[\begin{array}{cc}2 & -3 \\ 6 & 3\end{array}\right] \) if possible. If not possible, enter DNE.2 answers -
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Solve the system \[ \left[\begin{array}{l} x_{1} \\ x_{2} \\ x_{3} \\ x_{4} \end{array}\right]=\left[\begin{array}{l} \end{array}\right]+s\left[\begin{array}{l} ] \end{array}\right]+t[ \]2 answers