y = 2x + 13 the slope = 2
The second line will be perp when the slope = -1/2.....so.....
6y + ax = 6 + 5y - 3x simplify as
y = -ax - 3x + 6
y = - (a + 3) + 6 the slope = - (a + 3).....set this = -1/2
-1/2 = - (a + 3)
1/2 = a + 3
1/2 - 3 = a
1/2 - 6/2 = a
-5/2 = a
