Engineering↗
Parallel and Perpendicular Lines
Equal slopes for parallel, negative reciprocals for perpendicular, why the second rule holds, and the vertical-horizontal exception.
Every page in the KEVOS library tagged slope. 3 pages.
Equal slopes for parallel, negative reciprocals for perpendicular, why the second rule holds, and the vertical-horizontal exception.
Slope as rise over run, why it comes out the same whichever two points are used, and what its sign and size tell you.
Graph linear equations using slope-intercept form, rise over run, y-intercepts and transformations from standard form.