REAL ANSWERS ONLY PLEASE HELP

Given the graph below state whether or not the relation is a function, and give the domain and range.

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

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?