The equations $y=2x$y=2x, $y=2x+6$y=2x+6 and $y=2x-8$y=2x−8 have been graphed on the same number plane:
What do all of the equations have in common?
What do you notice about the graphs?
What can you conclude from the answers above?
On the coordinate plane, explore the proof for the relationship between slopes of parallel and perpendicular lines;
On the coordinate plane, determine if lines are parallel, perpendicular, or neither, based on their slopes;
On the coordinate plane, apply properties of parallel and perpendicular lines to solve geometric problems.