Which statement completes step 4 of the proof? coordinate plane with line f at y equals 3 times x plus 1 and line g at y equals negative one third times x plus 1. triangle jkl is at j negative 1 comma negative 2, k 0 comma 1, and l 0 comma negative 2. triangle j prime k l prime is at j prime negative 3 comma 2, k 0 comma 1, and l prime negative 3 comma 1. step 1 segment kl is parallel to the y-axis, and segment jl is parallel to the x-axis. step 2 δjkl was rotated 90° clockwise to create δj'kl'. point k did not change position, so it remains point k. therefore, δjkl ≅ δj'kl'. step 3 segment k l prime is perpendicular to the y-axis, and segment j prime l prime is perpendicular to the x-axis. step 4 ? step 5 segment j prime k lies on line g and has a slope of negative one third. step 6 the product of the slopes of segment jk and segment j prime k is −1; therefore, lines f and g are perpendicular. segment j prime k lies on line f and has a slope of 3. segment jk lies on line f and has a slope of 3. segment kl lies on line f and has a slope of 3. segment k l prime lies on line f and has a slope of 3.