When we know the slope of the line and we want a perpendicular line, we follow a specific rule.
We use the <em>opposite of the reciprocal</em> of the slope given.
Therefore, slope of 3 would give -1/3, slope of 1/2 would be -2, and so on.
Therefore, if we were to have a slope of 2/3, we take the opposite of the reciprocal to get -3/2.
I don't think your answer is here. If the lines are perpendicular, that has to be the answer; but do let me know if I made a mistake and I'd be glad to talk to you about this problem :) Hope this helps!
