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OpenStudy (anonymous):
How are slopes of parallel and perpendicular lines determined and how are they related?
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OpenStudy (anonymous):
Straight Line Equation: y=mx+c where m is the gradient The gradient of two parallel lines are equal. m1=m2 The gradient of perpendicular lines multiply to give -1. m1*m2=-1
OpenStudy (anonymous):
\[m=\frac{y_2-y_1}{x_2-x_1}\] Use this to find the gradient if the equation is unknown :)
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