Identify the independent and dependent variables. The equation t=12p+12 gives the total cost t (in dollars) of a meal with a tip of p percent (in decimal form).

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.