Which pair of equations are perpendicular lines? A. 5x + 2y = 9 and y = - 5/2x+27/2 B. x - 3y = 11 and y = - 3x + 23 C. 4x + 2y = 6 and y = - 2x + 18 D. x - 3y = 5 and y = 3x - 1

There is a really easy way to do this problem and that is to use a graphing website

after punching in the functions:

A. depending of whether it is - 5 / (2x) or (-5/2) x: intersecting but not perpendicular or parallel

B. These two lines are perpendicular

C. Parallel lines

D. intersecting but not perpendicular