Y is directly proportional to x. When x = 6, y = 9
Find x when y = 15

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.