Which statements must be true in the picture?

Abcd is a parallelogram find the valuse of x

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?

Secant be and cf intersect at point d inside a what is the measure of cde