Question 1169616
a) FALSE.  Perpendicular lines have slopes that are related by {{{m[2] = (-1)/m[1] }}}

b) y-y0 = m(x-x0),  m = (-4-(-9)) / (-2-3) = 5/(-5) = -1

y-(-9) = -1*(x - 3)
y+9 = -x+3

subtract 9 from both sides:
y = -x-6     (TRUE)