Please answer this correctly without making mistakes

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

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.