Unit 1 Lessons 1–20 Repertoire Hot Cross Buns D Journey C Boogie Five Woodpeckers Frog in the Middle Chocolate Listen for Bells Skills Piano posture C & D major pentascales Transposing Rhythmic dictation Composing rhythms Improvisation basics Adding chords while…

10.6 Inverting a Matrix We have seen that we can solve the system of equations described by $$\begin{pmatrix} 3&-4 \ 2&-1\end{pmatrix}\begin{pmatrix} x \ y\end{pmatrix} = \begin{pmatrix} 5 \ -10\end{pmatrix}$$ with Cramer’s rule. Rather than grinding through(打破砂锅问到底) Cramer’s rule, it sure…