Answer:
y = - 3x - 3
Explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
here m = - 3 , then
y = - 3x + c
the line crosses the y- axis at (0, - 3 ) ⇒ c = - 3
y = - 3x - 3 ← equation of line of reflection