Please help..! Tell if equation is a direct variation. If it is, find the constant of variation. y/x=3

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.

How many ordered pairs of positive integers satisfy xy=32?

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.