Please explain with full explanation​

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.

Ineed with the quizzes in apex mathematics ii

What is the solution to the system of equations? y=1.5-3 y=-x