Solve the System of Linear Equations $\left\{ \begin{array} { r } 3 x + y - 5 z = - 14 \\x - 2 z = - 4 \\- 7 x + 15 z = 31\end{array} \right.$

Q75: Solve the system of linear equations.

Q76: Write out the form of the

Q77: Given <span class="ql-formula" data-value="A =

Q78: State whether the equation <span

Q79: Use back-substitution to solve the triangular

Q81: Given <span class="ql-formula" data-value="A =

Q82: Find all solutions for the system.

Q83: Find the partial fraction decomposition of

Q84: A money manager invests <span

Q85: Find <span class="ql-formula" data-value="A ^