This year, christie has 15 fish in her tank. she has one
fish fewer than twice the number she had last year.
how many fish did she have last year?

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.