Solve the following system of equations using the substitution method

MATHEMATICS · Subjective · AoPS · Mathematics · Multi-Variable Linear Equations · Multi-Variable Linear Equations

Problem

Solve the following system of equations using the substitution method. Verify by substituting your values into both equations above.

\begin{aligned}-5a - 7b &= 11 \\ a - 2b &= -9\end{aligned}