I need help please help

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

Which of the following is the shape of a cross section of the figure shown below

I’m really confused and need your assist me with this question i’ve never been taught