Can u pls help me with 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?

Can someone me out here number 4 plz

Which of the following is not a subset of {1,2,3}?