The administrative assistant at a software company often provides breakfast when there is a morning meeting. For last week's sales meeting, she purchased 4 dozen doughnuts and 1 dozen croissants, spending a total of $34. In preparation for yesterday's safety meeting, she spent $52 on 7 dozen doughnuts and 1 dozen croissants. Write a system of equations that could be used in this situation.

Hint: I JUST WANT THE EQUATIONS NOT THE FINAL SOLUTION.