Give the equation of a line that is perpendicular to the graph of y = 3x + 8
m' = -1/m = -1/3
so any line of form
y = -(1/3) x + b
so pick b = 0
y=-(1/3) x
or
3y = -x
so any line of form
y = -(1/3) x + b
so pick b = 0
y=-(1/3) x
or
3y = -x