Which pair of equations represents perpendicular lines?
a x+2y=8 : 2x−y=−8
b x+2y=8 : 2x+y=8

c x+2y=8 : −x−2y=8
d x+2y=8 :−x−2y=−8

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Find the area of the triangle shown 3 by 6