Solve the System by Using Either the Substitution Method or the Elimination-By-Addition

Short Answer

Solve the system by using either the substitution method or the elimination-by-addition method, whichever seems more appropriate. $$\left( \begin{array} { c c c c } t & =& 9 u & + & 13 \\7 t & - &7 u & = & - 77\end{array} \right)$$ If the equations of the system are dependent, or if a system is inconsistent, so indicate. In those cases enter dependent or inconsistent . Otherwise, enter your answer as an ordered pair ( t , u ).