Last week at an insurance​ company, Dirk sold an average of 7 automobile and 6 homeowner policies per day over a 4​-day ​period, Lisa sold an average of 10 automobile and 9 homeowner policies per day over a 5​-day ​period, and Dakota sold an average of 8 automobile and 5 homeowner policies per day over a 5​-day period.
a) Express this information as a sum of scalar multiples of three 2×1 matrices.