Katie invested a total of ​$6000​, part at ​2% simple interest and part at ​3% simple interest. At the end of 1​ year, the investments had earned ​$152 interest. How much was invested at each​ rate?

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.