anonymous 4 years ago How are slopes of parallel and perpendicular lines determined and how are they related?

1. 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

2. anonymous

$m=\frac{y_2-y_1}{x_2-x_1}$ Use this to find the gradient if the equation is unknown :)