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OpenStudy (anonymous):
Find the slope of the line that passes through the given pair of points. (−a + 1, b − 3) and (a + 1, −b)
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Directrix (directrix):
slope = [(b - 3) - (-b)] / [(-a +1) - (a + 1)] = ([b - 3 + b)] / [ -a +1 -a -1 ] = (2b - 3) / (-2a) = -[ (2b - 3]) /[ -(-2a)] =( -2b + 3)/2a = (3 - 2b) / (2a)
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