Lines with the same slope don't intersect
Student work: This applet shows that if two lines have the same slope, they don't intersect. If they don't have the same slope, then they do intersect.
Dot Product: Geometric Significance and GeoGebra Coding
math 30-1 PT
copy line practice
ED Lineal Sol Particular
Student Explorer WMS395
Exploration 2 - Proportionallity with 3 Lines