Identify the domain of the function below {(1,2),(2,3),(3,4),(4,5),(5,6)}

The parabola opens: y=√x-4 (principal square root) up down right left

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?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?