3 The coordinates of P are (-3, 8) and the coordinates of Q are (9,-2). (c) Find the equation of the perpendicular bisector of PQ. midpoint -3+9,8+(2)) (313) M₂ M23 M₁ , 6 m³ •& (3,3) | y=mx xc y= x + c 3-(6)(3)+2 3-13-0 C = - Y=4x-3 [4]

Pam walks along a road which can be modeled by 3x, where (0, 0) represents her the equation y = starting point. When she reaches the point (7, 21), she turns right, so that she is traveling perpendicular to the original road, until she stops at a point which is due east of her starting point (in other words, on the x-axis). What is the point where Pam stops?