For what value of k are the graphs of 12y = 9x + 8 and 4y = k(x + 4) parallel?
perpendicular? I HAVE THE ANSWER, just need step to step explanation on how to solve it (pls be clear, answers in pic)

For what value of k are the graphs of 12y 9x 8 and 4y kx 4 parallel perpendicular I HAVE THE ANSWER just need step to step explanation on how to solve it pls be class=