What is the equation for an arithmetic equation sequence with a first term of 5 and a second term of 2?

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.

Ineed me i stuck and i don’t want to get it wrong

Which graph represents the equation y =4x