Explain the segment of decant theorem for geometry

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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?

Does the point (1, sqrt 7) lie on circle shown.