Practice problem
Which one of these lines is perpendicular to y=3x+3y=3x+3y=3x+3?
y=−3x−9y=-3x-9y=−3x−9
y=4x−3y=4x-3y=4x−3
y=−13x+7y=-\frac13 x +7y=−31x+7
y=6x+9y=6x+9y=6x+9
Type a concept, like “slope” or “photosynthesis”.
