Please help me ASAP with the second question I just can’t figure it out :.( brainliest will be given, 10 points for each answer as well

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

What is the perimeter of a rectangle if the length is 5 and the width is x?