Need asap! could you give me the equation to fill in the blanks and not the total

How do i do this activity, is appreciated

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

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.