PLZ ANSWER having a hard time with this one

What is the equation of the graph below? y=sec(x)-4

Find the value of the variable and the length of each secant segment.

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?