Question 443081
6x - 7y = 8
-7y = 8-6x
y = 6/7x - 8/7

6y - 7x = 5
6y  = 5+7x
y = 5/6 + 7/6x

So we have slopes 6/7 and 7/6.

To be perpendicular, the slopes must be negative reciprocals. That is, when you multiply the slopes together you get -1.

(6/7)*(7/6) = 1.

1 =/= -1

So, they are not perpendicular.