Solve the System by Substitution

Q115: Perform the indicated operation, if possible.<br>-

Q116: <span class="ql-formula" data-value="\begin{array} { l } x

Q117: Find the partial fraction decomposition.<br>- <span

Q118: Find the determinant of the given

Q119: Write a system of inequalities whose

Q121: Graph the linear inequality.<br>- <span class="ql-formula"

Q122: Solve the system by elimination.<br>-2x + y

Q123: Determine whether the matrices are inverses.<br>-

Q124: Use Gaussian elimination to solve the

Q125: Write the augmented matrix for the