Classify each sample as random, systematic, cluster, convenience, or stratified. A pollster wants to perform a survey in a middle school that has 43 classes. He selects at random 5 of these classes and then surveys all students in each of the five selected classes.

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.