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OpenStudy (anonymous):
find k so that the line through (5,4) and (k,8) is a) parellel to 5y-4x=1 b) perpendicular to 4y+3x=7
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OpenStudy (asnaseer):
first write the expression that represents the slope of the line through the two given points - lets call this m. then: a) parallel to 5y-4x=1 implies m has the same value as the slope of this line b) perpendicular to 4y+3x=7 implies m times the slope of this line equals -1
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