Which of the following functions best describes this graph?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

What is the equation of a line that passes through points (0, 4) and (-4,-8)?

Were only 64 seats. the remaining 6 students had to travel in a separate van. the equation 2b + 6 = 70 represents the given scenario. what does b represent? the number of buses the number of vans the number of students who rode on each bus the total number of students going to the football game