Final answer:
The question seeks the y-coordinate at the intersection of two perpendicular lines at x=4 but lacks sufficient information to find this intersection point.
Step-by-step explanation:
The question is asking for the intersection point of two lines with slopes that multiply to −1, at the x-coordinate of 4. However, the information provided about different linear equations and lines with various slopes does not directly address the intersection point of such lines at x = 4. In order to find the y-coordinate of the intersection point, we would need either the equations of the lines or at least one point from each line and their slopes. Since two lines with slopes that multiply to −1 are perpendicular, the slopes of these lines are negative reciprocals of each other. Without additional information, we cannot determine the y-coordinate for the point (4, ?).