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Mathematics 27 Online
OpenStudy (anonymous):

On the plane xy, there are 4 points: A(a, b), B(-1,0), C(2,1), & D(0,2). If ∠ABC = 90' & point D is on the side AC, then a & b = ?

OpenStudy (anonymous):

What is the slope of line AB|dw:1404642535368:dw|

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