If angle A and angle B are supplementary, and their measures are (3x + 50)o and (7x + 10)o respectively, find x, the measure of angle A and the measures of angle B.

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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?