Please can someone help with this question I’m very confused

Our goal is to collect email addresses from 60% of customers who purchase a product." so that means if i talk to 95 customers, i need to persuade to provide an email address?

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

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1