​(b) Plot the point that is symmetric to (3,3) with respect to the​ y-axis.

Answer 1

just change the sign of the x coordinate

(3,3) to (-3,3)

if the point is (x,y) a point symmetric to the y axis is (-x,y)

Answer 2

Dear Steven,

(-3,3) is symmetric to (3,3) across the y axis because both points are 3 units high and are 3 units from the y axis.