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OpenStudy (anonymous):
(8th grade Math) I dont understand it!! What is the slope of a line perpendicular to the line with equation y = 4x + 5? a.4 b.-4 c.-5 d.-1/4
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OpenStudy (anonymous):
perpendicular means 90 degrees to each other the rule is \[gradient \times gradient_{perpendicular}=-1\] \[m \times m_{p}=-1\]
OpenStudy (anonymous):
\[4 \times m_p=-1\]
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