Can someone plz plz help me with this question

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.

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Can someone tell me if this is perpendicular? !