Select all table to represent a proportional relationship

Find the vertex of the function given below y=x^2-6x+1

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?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.