Select all the graphs that show a proportional relationship

Is this correct ?

Explain why the factor 1.5 is broke. into two numbers in the model.

What is the slope of the line shown below?

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.