pre-calc 1.5 - Section 1.5 More on Slopes Parallel and...

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Section 1.5 More on Slopes Parallel and Perpendicular Lines 1.) Parallel Lines have the same slope. (Two lines are parallel if they lie in the same plane and never intersect.) -two distinct vertical lines, both with undefined slopes, are parallel EX 1: Write an equation of the line passing through (-2, 5) and parallel to the line whose equation is y = 3x + 1. Express the equation in point-slope form and slope-intercept form. 2.) Perpendicular Lines (Perpendicular lines are two lines who meet at a 90 degree angle.) - two lines are perpendicular if the product of their slopes is -1 - That is, one line is perpendicular to another if its slope is the negative reciprocal of the first. i.e. negative reciprocal of a = a 1 - - a horizontal line having slope zero is perpendicular to a vertical line having an undefined slope EX 2: Find the equation of the line perpendicular to x + 3y – 12 = 0 and that passes through (-1, 2). Slope as Rate of Change -refers to what slope really means when looking at a real relationship between quantities.
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pre-calc 1.5 - Section 1.5 More on Slopes Parallel and...

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