For what value of k are the graphs of y = 3x + 4 and 2y = kx + 9 parallel?

y = 3x + 4 is in y = mx + b form where m = slope = 3 parallel slope is also 3

2y = kx + 9 divide by 2

y = k/2 x + 4.5 k/2 has to equal 3 so k = 6