Math I dont understand

Question

Write an equation for a line perpendicular to y = − 3 x − 4 and passing through the point ( − 3 , − 3 )

Answer 1

y=x/3 +b

-3=-3/3 +b

b=-2

y=x/3 -2 is the perpendicular line through the given point

or

x-3y = 6 in standard form