What is the answer to the question

Can someone me do math because i am having a breakdown rn because i don’t get it

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%