Parallel & Perpendicular

Today in math class we learned about parrallel and perpendicular lines. We also learned how to write an equation that is parrallel and perpendicular. To tell if a line in parallel with another line is to see if they have the same slope. If they do then they are parallel lines. To write a perpendicular line, you just switch the slope. For example: y = 2x + b --> y = -1/2x + b. This is known as the multiplicative inverse. It is really simple and easy to do. We didn't go through much things today because most people in my class still can't find a slope. Anyways, I just hope I'm ready for the test tomorrow. Usually when Mr. S teaches us it makes sense, but the test is some crazy mojo.