equations of parallel and perpendicular lines.

Question

Which lines are perpendicular to the line y – 1 = (x+2)? Check all that apply.

y + 2 = –3(x – 4)

y − 5 = 3(x + 11)

y = -3x – 

y = x – 2

3x + y = 7

Answer 1

to be parallel requires the same slope

to be perpendicular requires the slopes be negative inverses

solve each for y and look at the coefficient of the x term, that's the slope

1st: perpendicular

2nd neither

3rd perpendicular

4th parallel

5th perpendicular