please help! I missed class once in algebra so now I don't understand it. I'd really appreciate it if you helped me and explained it! thanks!​

Explanation:Pay attention to the slopes of these lines. The slope is the value stuck to x.How to know if lines are perpendicular:The slopes are the negative reciprocals of each other. This means that in fraction form, their top and bottom are switched, and their sign changes from pos-->neg or neg-->pos.Ex of perpendicular lines:y = 3x + 2   AND  y = -1/3 x + 4y = 2/3x + 1  AND  y = -3/2x + 1Not perpendicular example: y = 3x + 1; y = 1/3x + 2 because sign not changed.How to know if lines are parallel:The slopes are the same.Ex: y = 5x + 12 is parallel to y = 5x + 300SPOILERSIn the question given to you:Lines a and c are parallel because they have the same slope, 8.Line b is not perpendicular to a and c because its slope sign is not negative to a and c.