So, on tests they try to trick you saying the slope between two points on a line is different but it is the same where ever you go on the line. They're similar triangles, not different triangles. (0,0) A (-6,-4) E (3,2) C Equation, Of course it's true. You rise or drop 2 and run over to the right. It means they're true since anywhere you go on the line your slope is the same.