MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
Horizontal lines are flat, like the horizon, and vertical lines go straight up and down. Both have only one variable in their equations, even when graphed in the xy plane: Horizontal lines have equations like y = ___ and vertical lines have equations like x = ___ when the blanks are just a constant. Horizontal lines have slope zero, and vertical lines have slope "undefined" or "no slope" (which sounds like zero, but is actually very different in math.)
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