Express as a single fraction in its simplest form

Which term best describes the association between variables a and b

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?

What expression is equivalent to 42x-56y