X+y=6 does this show direct variation? y-x=0 does this show direct variation?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Which of these triangle pairs can be mapped to each other using two reflections?

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.