Find x. (More info in the picture)

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

Can someone answer this question? : )

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?