A lighthouse is located at open paren 1 comma 2 close paren in a coordinate system measured in miles. A sailboat starts at open paren negative 7 comma 8 close paren and sails in a positive x -direction along a path that can be modeled by a quadratic function with a vertex at open paren 2 comma negative 6 close paren Which system of equations can be used to determine whether the boat comes within 5 miles of the lighthouse?