mathURGENT!!!!!!
posted by don .
the lines satisfying the equations x+2y=3 and 3y+ax=2 are perpendicular to each other. find the value of 'a'. please answer and explain how you got, please!!

slope of first line = 1/2
slope of 2nd line = a/3
to be perpendicular, they must be negative reciprocals of each other, or, when multiplied we should get 1
(1/2)(a/3) = 1
a/6 = 1
a = 6