By describing what conditions b1, b2, b3, b4 have to satisfy so that the system is solvable, we are actually describing of the coefficient matrix. Explain why.

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years