Tell whether the lines through the given points are parallel, perpendicular, or neither. Line 1: (1,2),(2,0) Line 2:(0 , -1), (-2,-2)

Answer 1

Perpendicular because the slopes are negative inverses

line 1 has slope (2-0)/(1-2) = -2

line 2 has slope (-1--2)/(0--2) = 1/2

-2 is the negative inverse of 1/2

change the sign and flip it over