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Mathematics 20 Online
OpenStudy (anonymous):

Find k so that the line through (k-1,k+2) and (4,-1) is perpendicular to the line througj (-3,2) and (2,3)

OpenStudy (anonymous):

find the two slopes m1,m2 then m1*m2=-1 \[m=\frac{ y2-y1 }{ x2-x1 }\]

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