Find the missing side lengths for x and y

Officer brimberry wrote 24 tickets for traffic violations last week, but only 9 tickets this week. what is the percent decrease? give your answer to the nearest tenth of a percent.

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

[15 points, algebra 2]simplify the complex fraction and find the restrictions.