PLZ someone help me! I will give the BRAINIEST!!!!!

private plane and a jetliner both fly over a park that is at (-2,2) on the map. The path of the jetliner follows the line y = 1/2 x - 3. The private plane flies perpendicular to the jetliner. What is the equation in slope-intercept form of a line that represents the private plane's flight path?​